Pandoc User's Guide

Updated 07082024-032832

Title: Pandoc - Pandoc User’s Guide
URL: https://pandoc.org/MANUAL.html
Tags: documentation, pandoc

Synopsis

pandoc[options] [input-file]…

Description

Pandoc is a Haskelllibrary for converting from one markup format to another, and a command-line tool that uses this library.

Pandoc can convert between numerous markup and word processing formats, including, but not limited to, various flavors of Markdown, HTML, LaTeX and Word docx. For the full lists of input and output formats, see the --from and --to options below. Pandoc can also produce PDF output: see creating a PDF, below.

Pandoc’s enhanced version of Markdown includes syntax for tables, definition lists, metadata blocks, footnotes, citations, math, and much more. See below under Pandoc’s Markdown.

Pandoc has a modular design: it consists of a set of readers, which parse text in a given format and produce a native representation of the document (an _abstract syntax tree_or AST), and a set of writers, which convert this native representation into a target format. Thus, adding an input or output format requires only adding a reader or writer. Users can also run custom pandoc filters to modify the intermediate AST.

Because pandoc’s intermediate representation of a document is less expressive than many of the formats it converts between, one should not expect perfect conversions between every format and every other. Pandoc attempts to preserve the structural elements of a document, but not formatting details such as margin size. And some document elements, such as complex tables, may not fit into pandoc’s simple document model. While conversions from pandoc’s Markdown to all formats aspire to be perfect, conversions from formats more expressive than pandoc’s Markdown can be expected to be lossy.

Using pandoc

If no input-files are specified, input is read from stdin. Output goes to stdout by default. For output to a file, use the -ooption:

    pandoc -o output.html input.txt

By default, pandoc produces a document fragment. To produce a standalone document (e.g. a valid HTML file including <head> and <body>), use the -s or --standalone flag:

    pandoc -s -o output.html input.txt

For more information on how standalone documents are produced, see Templates below.

If multiple input files are given, pandoc will concatenate them all (with blank lines between them) before parsing. (Use --file-scope to parse files individually.)

Specifying formats

The format of the input and output can be specified explicitly using command-line options. The input format can be specified using the -f/--from option, the output format using the -t/--to option. Thus, to convert hello.txt from Markdown to LaTeX, you could type:

    pandoc -f markdown -t latex hello.txt

To convert hello.htmlfrom HTML to Markdown:

    pandoc -f html -t markdown hello.html

Supported input and output formats are listed below under Options (see -f for input formats and -t for output formats). You can also use pandoc --list-input-formats and pandoc --list-output-formats to print lists of supported formats.

If the input or output format is not specified explicitly, pandoc will attempt to guess it from the extensions of the filenames. Thus, for example,

    pandoc -o hello.tex hello.txt

will convert hello.txtfrom Markdown to LaTeX. If no output file is specified (so that output goes to stdout), or if the output file’s extension is unknown, the output format will default to HTML. If no input file is specified (so that input comes from stdin), or if the input files’ extensions are unknown, the input format will be assumed to be Markdown.

Character encoding

Pandoc uses the UTF-8 character encoding for both input and output. If your local character encoding is not UTF-8, you should pipe input and output through iconv:

    iconv -t utf-8 input.txt | pandoc | iconv -f utf-8

Note that in some output formats (such as HTML, LaTeX, ConTeXt, RTF, OPML, DocBook, and Texinfo), information about the character encoding is included in the document header, which will only be included if you use the -s/--standalone option.

Creating a PDF

To produce a PDF, specify an output file with a .pdf extension:

    pandoc test.txt -o test.pdf

By default, pandoc will use LaTeX to create the PDF, which requires that a LaTeX engine be installed (see --pdf-engine below). Alternatively, pandoc can use ConTeXt, roff ms, or HTML as an intermediate format. To do this, specify an output file with a .pdf extension, as before, but add the --pdf-engine option or -t context, -t html, or -t ms to the command line. The tool used to generate the PDF from the intermediate format may be specified using --pdf-engine.

You can control the PDF style using variables, depending on the intermediate format used: see variables for LaTeX, variables for ConTeXt, variables for wkhtmltopdf, variables for ms. When HTML is used as an intermediate format, the output can be styled using --css.

To debug the PDF creation, it can be useful to look at the intermediate representation: instead of -o test.pdf, use for example -s -o test.tex to output the generated LaTeX. You can then test it with pdflatex test.tex.

When using LaTeX, the following packages need to be available (they are included with all recent versions of TeX Live): amsfonts, amsmath, lm, unicode-math, iftex, listings (if the --listings option is used), fancyvrb, longtable, booktabs, [multirow] (if the document contains a table with cells that cross multiple rows), graphicx (if the document contains images), bookmark, xcolor, soul, geometry (with the geometry variable set), setspace (with linestretch), and babel (with lang). If CJKmainfont is set, xeCJK is needed. framed is required if code is highlighted in a scheme that use a colored background. The use of xelatex or lualatex as the PDF engine requires fontspec. lualatex uses selnolig and lua-ul. xelatex uses bidi (with the dir variable set). If the mathspec variable is set, xelatex will use mathspec instead of unicode-math. The upquote and microtype packages are used if available, and csquotes will be used for typography if the csquotes variable or metadata field is set to a true value. The natbib, biblatex, bibtex, and biber packages can optionally be used for citation rendering. The following packages will be used to improve output quality if present, but pandoc does not require them to be present: upquote (for straight quotes in verbatim environments), microtype (for better spacing adjustments), parskip (for better inter-paragraph spaces), xurl (for better line breaks in URLs), and footnotehyper or footnote (to allow footnotes in tables).

Reading from the Web

Instead of an input file, an absolute URI may be given. In this case pandoc will fetch the content using HTTP:

    pandoc -f html -t markdown https://www.fsf.org

It is possible to supply a custom User-Agent string or other header when requesting a document from a URL:

    pandoc -f html -t markdown --request-header User-Agent:"Mozilla/5.0" \
  https://www.fsf.org

Options

General options

-f FORMAT, -r FORMAT, --from=FORMAT, --read=FORMAT

Specify input format. FORMAT can be:

Extensions can be individually enabled or disabled by appending +EXTENSION or -EXTENSION to the format name. See Extensions below, for a list of extensions and their names. See --list-input-formats and --list-extensions, below.

-t FORMAT, -w FORMAT, --to=FORMAT, --write=FORMAT

Specify output format. FORMAT can be:

Note that odt, docx, epub, and pdf output will not be directed to stdout unless forced with -o -.

Extensions can be individually enabled or disabled by appending +EXTENSION or -EXTENSION to the format name. See Extensions below, for a list of extensions and their names. See --list-output-formats and --list-extensions, below.

-o FILE, --output=FILE

Write output to FILE instead of stdout. If FILE is -, output will go to stdout, even if a non-textual format (docx, odt, epub2, epub3) is specified. If the output format is chunkedhtml and _FILE_has no extension, then instead of producing a .zip file pandoc will create a directory FILE and unpack the zip archive there (unless FILE already exists, in which case an error will be raised).

--data-dir=DIRECTORY

Specify the user data directory to search for pandoc data files. If this option is not specified, the default user data directory will be used. On *nix and macOS systems this will be the pandoc subdirectory of the XDG data directory (by default, $HOME/.local/share, overridable by setting the XDG_DATA_HOME environment variable). If that directory does not exist and $HOME/.pandoc exists, it will be used (for backwards compatibility). On Windows the default user data directory is %APPDATA%\pandoc. You can find the default user data directory on your system by looking at the output of pandoc --version. Data files placed in this directory (for example, reference.odt, reference.docx, epub.css, templates) will override pandoc’s normal defaults. (Note that the user data directory is not created by pandoc, so you will need to create it yourself if you want to make use of it.)

-d FILE, --defaults=FILE

Specify a set of default option settings. FILE is a YAML file whose fields correspond to command-line option settings. All options for document conversion, including input and output files, can be set using a defaults file. The file will be searched for first in the working directory, and then in the defaults subdirectory of the user data directory (see --data-dir). The .yaml extension may be omitted. See the section Defaults files for more information on the file format. Settings from the defaults file may be overridden or extended by subsequent options on the command line.

--bash-completion

Generate a bash completion script. To enable bash completion with pandoc, add this to your .bashrc:

    eval "$(pandoc --bash-completion)"

--verbose

Give verbose debugging output.

--quiet

Suppress warning messages.

--fail-if-warnings[=true|false]

Exit with error status if there are any warnings.

--log=FILE

Write log messages in machine-readable JSON format to FILE. All messages above DEBUG level will be written, regardless of verbosity settings (--verbose, --quiet).

--list-input-formats

List supported input formats, one per line.

--list-output-formats

List supported output formats, one per line.

--list-extensions[=FORMAT]

List supported extensions for FORMAT, one per line, preceded by a + or - indicating whether it is enabled by default in FORMAT. If FORMAT is not specified, defaults for pandoc’s Markdown are given.

--list-highlight-languages

List supported languages for syntax highlighting, one per line.

--list-highlight-styles

List supported styles for syntax highlighting, one per line. See --highlight-style.

-v, --version

Print version.

-h, --help

Show usage message.

Reader options

--shift-heading-level-by=NUMBER

Shift heading levels by a positive or negative integer. For example, with --shift-heading-level-by=-1, level 2 headings become level 1 headings, and level 3 headings become level 2 headings. Headings cannot have a level less than 1, so a heading that would be shifted below level 1 becomes a regular paragraph. Exception: with a shift of -N, a level-N heading at the beginning of the document replaces the metadata title. --shift-heading-level-by=-1is a good choice when converting HTML or Markdown documents that use an initial level-1 heading for the document title and level-2+ headings for sections. --shift-heading-level-by=1may be a good choice for converting Markdown documents that use level-1 headings for sections to HTML, since pandoc uses a level-1 heading to render the document title.

Deprecated. Use --shift-heading-level-by=X instead, where X = NUMBER - 1. Specify the base level for headings (defaults to 1).

--indented-code-classes=CLASSES

Specify classes to use for indented code blocks—for example, perl,numberLines or haskell. Multiple classes may be separated by spaces or commas.

--default-image-extension=EXTENSION

Specify a default extension to use when image paths/URLs have no extension. This allows you to use the same source for formats that require different kinds of images. Currently this option only affects the Markdown and LaTeX readers.

--file-scope[=true|false]

Parse each file individually before combining for multifile documents. This will allow footnotes in different files with the same identifiers to work as expected. If this option is set, footnotes and links will not work across files. Reading binary files (docx, odt, epub) implies --file-scope.

If two or more files are processed using --file-scope, prefixes based on the filenames will be added to identifiers in order to disambiguate them, and internal links will be adjusted accordingly. For example, a header with identifier foo in subdir/file1.txt will have its identifier changed to subdir__file1.txt__foo.

-F PROGRAM, --filter=PROGRAM

Specify an executable to be used as a filter transforming the pandoc AST after the input is parsed and before the output is written. The executable should read JSON from stdin and write JSON to stdout. The JSON must be formatted like pandoc’s own JSON input and output. The name of the output format will be passed to the filter as the first argument. Hence,

    pandoc --filter ./caps.py -t latex

is equivalent to

    pandoc -t json | ./caps.py latex | pandoc -f json -t latex

The latter form may be useful for debugging filters.

Filters may be written in any language. Text.Pandoc.JSON exports toJSONFilter to facilitate writing filters in Haskell. Those who would prefer to write filters in python can use the module pandocfilters, installable from PyPI. There are also pandoc filter libraries in PHP, perl, and JavaScript/node.js.

In order of preference, pandoc will look for filters in

  1. a specified full or relative path (executable or non-executable),

  2. $DATADIR/filters(executable or non-executable) where $DATADIR is the user data directory (see --data-dir, above),

  3. $PATH (executable only).

Filters, Lua-filters, and citeproc processing are applied in the order specified on the command line.

-L SCRIPT, --lua-filter=SCRIPT

Transform the document in a similar fashion as JSON filters (see --filter), but use pandoc’s built-in Lua filtering system. The given Lua script is expected to return a list of Lua filters which will be applied in order. Each Lua filter must contain element-transforming functions indexed by the name of the AST element on which the filter function should be applied.

The pandoc Lua module provides helper functions for element creation. It is always loaded into the script’s Lua environment.

See the Lua filters documentation for further details.

In order of preference, pandoc will look for Lua filters in

  1. a specified full or relative path,

  2. $DATADIR/filterswhere $DATADIR is the user data directory (see --data-dir, above).

Filters, Lua filters, and citeproc processing are applied in the order specified on the command line.

-M KEY[=VAL], --metadata=KEY[:VAL]

Set the metadata field KEY to the value VAL. A value specified on the command line overrides a value specified in the document using YAML metadata blocks. Values will be parsed as YAML boolean or string values. If no value is specified, the value will be treated as Boolean true. Like --variable, --metadata causes template variables to be set. But unlike --variable, --metadata affects the metadata of the underlying document (which is accessible from filters and may be printed in some output formats) and metadata values will be escaped when inserted into the template.

--metadata-file=FILE

Read metadata from the supplied YAML (or JSON) file. This option can be used with every input format, but string scalars in the metadata file will always be parsed as Markdown. (If the input format is Markdown or a Markdown variant, then the same variant will be used to parse the metadata file; if it is a non-Markdown format, pandoc’s default Markdown extensions will be used.) This option can be used repeatedly to include multiple metadata files; values in files specified later on the command line will be preferred over those specified in earlier files. Metadata values specified inside the document, or by using -M, overwrite values specified with this option. The file will be searched for first in the working directory, and then in the metadata subdirectory of the user data directory (see --data-dir).

-p, --preserve-tabs[=true|false]

Preserve tabs instead of converting them to spaces. (By default, pandoc converts tabs to spaces before parsing its input.) Note that this will only affect tabs in literal code spans and code blocks. Tabs in regular text are always treated as spaces.

--tab-stop=NUMBER

Specify the number of spaces per tab (default is 4).

--track-changes=accept|reject|all

Specifies what to do with insertions, deletions, and comments produced by the MS Word “Track Changes” feature. accept (the default) processes all the insertions and deletions. reject ignores them. Both accept and reject ignore comments. all includes all insertions, deletions, and comments, wrapped in spans with insertion, deletion, comment-start, and comment-end classes, respectively. The author and time of change is included. all is useful for scripting: only accepting changes from a certain reviewer, say, or before a certain date. If a paragraph is inserted or deleted, track-changes=all produces a span with the class paragraph-insertion/paragraph-deletion before the affected paragraph break. This option only affects the docx reader.

Extract images and other media contained in or linked from the source document to the path DIR, creating it if necessary, and adjust the images references in the document so they point to the extracted files. Media are downloaded, read from the file system, or extracted from a binary container (e.g. docx), as needed. The original file paths are used if they are relative paths not containing ... Otherwise filenames are constructed from the SHA1 hash of the contents.

--abbreviations=FILE

Specifies a custom abbreviations file, with abbreviations one to a line. If this option is not specified, pandoc will read the data file abbreviationsfrom the user data directory or fall back on a system default. To see the system default, use pandoc --print-default-data-file=abbreviations. The only use pandoc makes of this list is in the Markdown reader. Strings found in this list will be followed by a nonbreaking space, and the period will not produce sentence-ending space in formats like LaTeX. The strings may not contain spaces.

--trace[=true|false]

Print diagnostic output tracing parser progress to stderr. This option is intended for use by developers in diagnosing performance issues.

General writer options

-s, --standalone

Produce output with an appropriate header and footer (e.g. a standalone HTML, LaTeX, TEI, or RTF file, not a fragment). This option is set automatically for pdf, epub, epub3, fb2, docx, and odt output. For native output, this option causes metadata to be included; otherwise, metadata is suppressed.

--template=FILE|URL

Use the specified file as a custom template for the generated document. Implies --standalone. See Templates, below, for a description of template syntax. If no extension is specified, an extension corresponding to the writer will be added, so that --template=special looks for special.html for HTML output. If the template is not found, pandoc will search for it in the templatessubdirectory of the user data directory (see --data-dir). If this option is not used, a default template appropriate for the output format will be used (see -D/--print-default-template).

-V KEY[=VAL], --variable=KEY[:VAL]

Set the template variable KEY to the value VAL when rendering the document in standalone mode. If no VAL is specified, the key will be given the value true.

--sandbox[=true|false]

Run pandoc in a sandbox, limiting IO operations in readers and writers to reading the files specified on the command line. Note that this option does not limit IO operations by filters or in the production of PDF documents. But it does offer security against, for example, disclosure of files through the use of include directives. Anyone using pandoc on untrusted user input should use this option.

Note: some readers and writers (e.g., docx) need access to data files. If these are stored on the file system, then pandoc will not be able to find them when run in --sandbox mode and will raise an error. For these applications, we recommend using a pandoc binary compiled with the embed_data_files option, which causes the data files to be baked into the binary instead of being stored on the file system.

-D FORMAT, --print-default-template=FORMAT

Print the system default template for an output FORMAT. (See -t for a list of possible _FORMAT_s.) Templates in the user data directory are ignored. This option may be used with -o/--output to redirect output to a file, but -o/--output must come before --print-default-template on the command line.

Note that some of the default templates use partials, for example styles.html. To print the partials, use --print-default-data-file: for example, --print-default-data-file=templates/styles.html.

--print-default-data-file=FILE

Print a system default data file. Files in the user data directory are ignored. This option may be used with -o/--output to redirect output to a file, but -o/--output must come before --print-default-data-fileon the command line.

--eol=crlf|lf|native

Manually specify line endings: crlf (Windows), lf (macOS/Linux/UNIX), or native (line endings appropriate to the OS on which pandoc is being run). The default is native.

--dpi=NUMBER

Specify the default dpi (dots per inch) value for conversion from pixels to inch/centimeters and vice versa. (Technically, the correct term would be ppi: pixels per inch.) The default is 96dpi. When images contain information about dpi internally, the encoded value is used instead of the default specified by this option.

--wrap=auto|none|preserve

Determine how text is wrapped in the output (the source code, not the rendered version). With auto (the default), pandoc will attempt to wrap lines to the column width specified by --columns (default 72). With none, pandoc will not wrap lines at all. With preserve, pandoc will attempt to preserve the wrapping from the source document (that is, where there are nonsemantic newlines in the source, there will be nonsemantic newlines in the output as well). In ipynb output, this option affects wrapping of the contents of Markdown cells.

--columns=NUMBER

Specify length of lines in characters. This affects text wrapping in the generated source code (see --wrap). It also affects calculation of column widths for plain text tables (see Tables below).

--toc[=true|false], --table-of-contents[=true|false]

Include an automatically generated table of contents (or, in the case of latex, context, docx, odt, opendocument, rst, or ms, an instruction to create one) in the output document. This option has no effect unless -s/--standalone is used, and it has no effect on man, docbook4, docbook5, or jats output.

Note that if you are producing a PDF via ms, the table of contents will appear at the beginning of the document, before the title. If you would prefer it to be at the end of the document, use the option --pdf-engine-opt=--no-toc-relocation.

--toc-depth=NUMBER

Specify the number of section levels to include in the table of contents. The default is 3 (which means that level-1, 2, and 3 headings will be listed in the contents).

Strip out HTML comments in the Markdown or Textile source, rather than passing them on to Markdown, Textile or HTML output as raw HTML. This does not apply to HTML comments inside raw HTML blocks when the markdown_in_html_blocksextension is not set.

--no-highlight

Disables syntax highlighting for code blocks and inlines, even when a language attribute is given.

--highlight-style=STYLE|FILE

Specifies the coloring style to be used in highlighted source code. Options are pygments (the default), kate, monochrome, breezeDark, espresso, zenburn, haddock, and tango. For more information on syntax highlighting in pandoc, see Syntax highlighting, below. See also --list-highlight-styles.

Instead of a STYLE name, a JSON file with extension .theme may be supplied. This will be parsed as a KDE syntax highlighting theme and (if valid) used as the highlighting style.

To generate the JSON version of an existing style, use --print-highlight-style.

--print-highlight-style=STYLE|FILE

Prints a JSON version of a highlighting style, which can be modified, saved with a .theme extension, and used with --highlight-style. This option may be used with -o/--output to redirect output to a file, but -o/--output must come before --print-highlight-style on the command line.

--syntax-definition=FILE

Instructs pandoc to load a KDE XML syntax definition file, which will be used for syntax highlighting of appropriately marked code blocks. This can be used to add support for new languages or to use altered syntax definitions for existing languages. This option may be repeated to add multiple syntax definitions.

Include contents of FILE, verbatim, at the end of the header. This can be used, for example, to include special CSS or JavaScript in HTML documents. This option can be used repeatedly to include multiple files in the header. They will be included in the order specified. Implies --standalone.

-B FILE, --include-before-body=FILE|URL

Include contents of FILE, verbatim, at the beginning of the document body (e.g. after the <body> tag in HTML, or the \begin{document}command in LaTeX). This can be used to include navigation bars or banners in HTML documents. This option can be used repeatedly to include multiple files. They will be included in the order specified. Implies --standalone. Note that if the output format is odt, this file must be in OpenDocument XML format suitable for insertion into the body of the document, and if the output is docx, this file must be in appropriate OpenXML format.

-A FILE, --include-after-body=FILE|URL

Include contents of FILE, verbatim, at the end of the document body (before the </body> tag in HTML, or the \end{document}command in LaTeX). This option can be used repeatedly to include multiple files. They will be included in the order specified. Implies --standalone. Note that if the output format is odt, this file must be in OpenDocument XML format suitable for insertion into the body of the document, and if the output is docx, this file must be in appropriate OpenXML format.

--resource-path=SEARCHPATH

List of paths to search for images and other resources. The paths should be separated by : on Linux, UNIX, and macOS systems, and by ; on Windows. If --resource-path is not specified, the default resource path is the working directory. Note that, if --resource-path is specified, the working directory must be explicitly listed or it will not be searched. For example: --resource-path=.:test will search the working directory and the test subdirectory, in that order. This option can be used repeatedly. Search path components that come later on the command line will be searched before those that come earlier, so --resource-path foo:bar --resource-path baz:bimis equivalent to --resource-path baz:bim:foo:bar. Note that this option only has an effect when pandoc itself needs to find an image (e.g., in producing a PDF or docx, or when --embed-resources is used.) It will not cause image paths to be rewritten in other cases (e.g., when pandoc is generating LaTeX or HTML).

Set the request header NAME to the value _VAL_when making HTTP requests (for example, when a URL is given on the command line, or when resources used in a document must be downloaded). If you’re behind a proxy, you also need to set the environment variable http_proxy to http://....

--no-check-certificate[=true|false]

Disable the certificate verification to allow access to unsecure HTTP resources (for example when the certificate is no longer valid or self signed).

Options affecting specific writers

--self-contained[=true|false]

Deprecated synonym for --embed-resources --standalone.

--embed-resources[=true|false]

Produce a standalone HTML file with no external dependencies, using data: URIs to incorporate the contents of linked scripts, stylesheets, images, and videos. The resulting file should be “self-contained,” in the sense that it needs no external files and no net access to be displayed properly by a browser. This option works only with HTML output formats, including html4, html5, html+lhs, html5+lhs, s5, slidy, slideous, dzslides, and revealjs. Scripts, images, and stylesheets at absolute URLs will be downloaded; those at relative URLs will be sought relative to the working directory (if the first source file is local) or relative to the base URL (if the first source file is remote). Elements with the attribute data-external="1" will be left alone; the documents they link to will not be incorporated in the document. Limitation: resources that are loaded dynamically through JavaScript cannot be incorporated; as a result, fonts may be missing when --mathjax is used, and some advanced features (e.g. zoom or speaker notes) may not work in an offline “self-contained” reveal.js slide show.

For SVG images, imgtags with data: URIs are used, unless the image has the class inline-svg, in which case an inline SVG element is inserted. This approach is recommended when there are many occurrences of the same SVG in a document, as <use> elements will be used to reduce duplication.

--html-q-tags[=true|false]

Use <q> tags for quotes in HTML. (This option only has an effect if the smart extension is enabled for the input format used.)

--ascii[=true|false]

Use only ASCII characters in output. Currently supported for XML and HTML formats (which use entities instead of UTF-8 when this option is selected), CommonMark, gfm, and Markdown (which use entities), roff man and ms (which use hexadecimal escapes), and to a limited degree LaTeX (which uses standard commands for accented characters when possible).

--reference-links[=true|false]

Use reference-style links, rather than inline links, in writing Markdown or reStructuredText. By default inline links are used. The placement of link references is affected by the --reference-locationoption.

--reference-location=block|section|document

Specify whether footnotes (and references, if reference-links is set) are placed at the end of the current (top-level) block, the current section, or the document. The default is document. Currently this option only affects the markdown, muse, html, epub, slidy, s5, slideous, dzslides, and revealjs writers. In slide formats, specifying --reference-location=sectionwill cause notes to be rendered at the bottom of a slide.

--markdown-headings=setext|atx

Specify whether to use ATX-style (#-prefixed) or Setext-style (underlined) headings for level 1 and 2 headings in Markdown output. (The default is atx.) ATX-style headings are always used for levels 3+. This option also affects Markdown cells in ipynb output.

--list-tables[=true|false]

Render tables as list tables in RST output.

--top-level-division=default|section|chapter|part

Treat top-level headings as the given division type in LaTeX, ConTeXt, DocBook, and TEI output. The hierarchy order is part, chapter, then section; all headings are shifted such that the top-level heading becomes the specified type. The default behavior is to determine the best division type via heuristics: unless other conditions apply, section is chosen. When the documentclass variable is set to report, book, or memoir (unless the article option is specified), chapter is implied as the setting for this option. If beamer is the output format, specifying either chapteror part will cause top-level headings to become \part{..}, while second-level headings remain as their default type.

-N, --number-sections

Number section headings in LaTeX, ConTeXt, HTML, Docx, ms, or EPUB output. By default, sections are not numbered. Sections with class unnumbered will never be numbered, even if --number-sections is specified.

--number-offset=NUMBER[,NUMBER,…]

Offset for section headings in HTML output (ignored in other output formats). The first number is added to the section number for top-level headings, the second for second-level headings, and so on. So, for example, if you want the first top-level heading in your document to be numbered “6”, specify --number-offset=5. If your document starts with a level-2 heading which you want to be numbered “1.5”, specify --number-offset=1,4. Offsets are 0 by default. Implies --number-sections.

--listings[=true|false]

Use the listings package for LaTeX code blocks. The package does not support multi-byte encoding for source code. To handle UTF-8 you would need to use a custom template. This issue is fully documented here: Encoding issue with the listings package.

-i, --incremental[=true|false]

Make list items in slide shows display incrementally (one by one). The default is for lists to be displayed all at once.

--slide-level=NUMBER

Specifies that headings with the specified level create slides (for beamer, revealjs, pptx, s5, slidy, slideous, dzslides). Headings above this level in the hierarchy are used to divide the slide show into sections; headings below this level create subheads within a slide. Valid values are 0-6. If a slide level of 0 is specified, slides will not be split automatically on headings, and horizontal rules must be used to indicate slide boundaries. If a slide level is not specified explicitly, the slide level will be set automatically based on the contents of the document; see Structuring the slide show.

--section-divs[=true|false]

Wrap sections in <section> tags (or <div> tags for html4), and attach identifiers to the enclosing <section> (or <div>) rather than the heading itself (see Heading identifiers, below). This option only affects HTML output (and does not affect HTML slide formats).

--email-obfuscation=none|javascript|references

Specify a method for obfuscating mailto: links in HTML documents. none leaves mailto: links as they are. javascriptobfuscates them using JavaScript. references obfuscates them by printing their letters as decimal or hexadecimal character references. The default is none.

--id-prefix=STRING

Specify a prefix to be added to all identifiers and internal links in HTML and DocBook output, and to footnote numbers in Markdown and Haddock output. This is useful for preventing duplicate identifiers when generating fragments to be included in other pages.

-T STRING, --title-prefix=STRING

Specify STRING as a prefix at the beginning of the title that appears in the HTML header (but not in the title as it appears at the beginning of the HTML body). Implies --standalone.

-c URL, --css=URL

Link to a CSS style sheet. This option can be used repeatedly to include multiple files. They will be included in the order specified. This option only affects HTML (including HTML slide shows) and EPUB output. It should be used together with -s/--standalone, because the link to the stylesheet goes in the document header.

A stylesheet is required for generating EPUB. If none is provided using this option (or the css or stylesheet metadata fields), pandoc will look for a file epub.css in the user data directory (see --data-dir). If it is not found there, sensible defaults will be used.

--reference-doc=FILE|URL

Use the specified file as a style reference in producing a docx or ODT file.

Docx

For best results, the reference docx should be a modified version of a docx file produced using pandoc. The contents of the reference docx are ignored, but its stylesheets and document properties (including margins, page size, header, and footer) are used in the new docx. If no reference docx is specified on the command line, pandoc will look for a file reference.docx in the user data directory (see --data-dir). If this is not found either, sensible defaults will be used.

To produce a custom reference.docx, first get a copy of the default reference.docx: pandoc -o custom-reference.docx --print-default-data-file reference.docx. Then open custom-reference.docx in Word, modify the styles as you wish, and save the file. For best results, do not make changes to this file other than modifying the styles used by pandoc:

Paragraph styles:

Character styles:

Table style:

ODT

For best results, the reference ODT should be a modified version of an ODT produced using pandoc. The contents of the reference ODT are ignored, but its stylesheets are used in the new ODT. If no reference ODT is specified on the command line, pandoc will look for a file reference.odt in the user data directory (see --data-dir). If this is not found either, sensible defaults will be used.

To produce a custom reference.odt, first get a copy of the default reference.odt: pandoc -o custom-reference.odt --print-default-data-file reference.odt. Then open custom-reference.odt in LibreOffice, modify the styles as you wish, and save the file.

PowerPoint

Templates included with Microsoft PowerPoint 2013 (either with .pptx or .potx extension) are known to work, as are most templates derived from these.

The specific requirement is that the template should contain layouts with the following names (as seen within PowerPoint):

For each name, the first layout found with that name will be used. If no layout is found with one of the names, pandoc will output a warning and use the layout with that name from the default reference doc instead. (How these layouts are used is described in PowerPoint layout choice.)

All templates included with a recent version of MS PowerPoint will fit these criteria. (You can click on Layout under the Home menu to check.)

You can also modify the default reference.pptx: first run pandoc -o custom-reference.pptx --print-default-data-file reference.pptx, and then modify custom-reference.pptx in MS PowerPoint (pandoc will use the layouts with the names listed above).

--split-level=NUMBER

Specify the heading level at which to split an EPUB or chunked HTML document into separate files. The default is to split into chapters at level-1 headings. In the case of EPUB, this option only affects the internal composition of the EPUB, not the way chapters and sections are displayed to users. Some readers may be slow if the chapter files are too large, so for large documents with few level-1 headings, one might want to use a chapter level of 2 or 3. For chunked HTML, this option determines how much content goes in each “chunk.”

--chunk-template=PATHTEMPLATE

Specify a template for the filenames in a chunkedhtml document. In the template, %n will be replaced by the chunk number (padded with leading 0s to 3 digits), %s with the section number of the chunk, %hwith the heading text (with formatting removed), %i with the section identifier. For example, %section-%s-%i.html might be resolved to section-1.1-introduction.html. The characters / and \` are not allowed in chunk templates and will be ignored. The default is%s-%i.html`.

--epub-chapter-level=NUMBER

Deprecated synonym for --split-level.

--epub-cover-image=FILE

Use the specified image as the EPUB cover. It is recommended that the image be less than 1000px in width and height. Note that in a Markdown source document you can also specify cover-image in a YAML metadata block (see EPUB Metadata, below).

--epub-title-page=true|false

Determines whether a the title page is included in the EPUB (default is true).

--epub-metadata=FILE

Look in the specified XML file for metadata for the EPUB. The file should contain a series of Dublin Core elements. For example:

     <dc:rights>Creative Commons</dc:rights>
 <dc:language>es-AR</dc:language>

By default, pandoc will include the following metadata elements: <dc:title> (from the document title), <dc:creator> (from the document authors), <dc:date> (from the document date, which should be in ISO 8601 format), <dc:language> (from the lang variable, or, if is not set, the locale), and <dc:identifier id="BookId">(a randomly generated UUID). Any of these may be overridden by elements in the metadata file.

Note: if the source document is Markdown, a YAML metadata block in the document can be used instead. See below under EPUB Metadata.

--epub-embed-font=FILE

Embed the specified font in the EPUB. This option can be repeated to embed multiple fonts. Wildcards can also be used: for example, DejaVuSans-*.ttf. However, if you use wildcards on the command line, be sure to escape them or put the whole filename in single quotes, to prevent them from being interpreted by the shell. To use the embedded fonts, you will need to add declarations like the following to your CSS (see --css):

    @font-face {
   font-family: DejaVuSans;
   font-style: normal;
   font-weight: normal;
   src:url("../fonts/DejaVuSans-Regular.ttf");
}
@font-face {
   font-family: DejaVuSans;
   font-style: normal;
   font-weight: bold;
   src:url("../fonts/DejaVuSans-Bold.ttf");
}
@font-face {
   font-family: DejaVuSans;
   font-style: italic;
   font-weight: normal;
   src:url("../fonts/DejaVuSans-Oblique.ttf");
}
@font-face {
   font-family: DejaVuSans;
   font-style: italic;
   font-weight: bold;
   src:url("../fonts/DejaVuSans-BoldOblique.ttf");
}
body { font-family: "DejaVuSans"; }

--epub-subdirectory=DIRNAME

Specify the subdirectory in the OCF container that is to hold the EPUB-specific contents. The default is EPUB. To put the EPUB contents in the top level, use an empty string.

--ipynb-output=all|none|best

Determines how ipynb output cells are treated. all means that all of the data formats included in the original are preserved. none means that the contents of data cells are omitted. best causes pandoc to try to pick the richest data block in each output cell that is compatible with the output format. The default is best.

--pdf-engine=PROGRAM

Use the specified engine when producing PDF output. Valid values are pdflatex, lualatex, xelatex, latexmk, tectonic, wkhtmltopdf, weasyprint, pagedjs-cli, prince, context, pdfroff, and typst. If the engine is not in your PATH, the full path of the engine may be specified here. If this option is not specified, pandoc uses the following defaults depending on the output format specified using -t/--to:

--pdf-engine-opt=STRING

Use the given string as a command-line argument to the pdf-engine. For example, to use a persistent directory foo for latexmk’s auxiliary files, use --pdf-engine-opt=-outdir=foo. Note that no check for duplicate options is done.

Citation rendering

-C, --citeproc

Process the citations in the file, replacing them with rendered citations and adding a bibliography. Citation processing will not take place unless bibliographic data is supplied, either through an external file specified using the --bibliography option or the bibliography field in metadata, or via a references section in metadata containing a list of citations in CSL YAML format with Markdown formatting. The style is controlled by a CSLstylesheet specified using the --csloption or the csl field in metadata. (If no stylesheet is specified, the chicago-author-date style will be used by default.) The citation processing transformation may be applied before or after filters or Lua filters (see --filter, --lua-filter): these transformations are applied in the order they appear on the command line. For more information, see the section on Citations.

--bibliography=FILE

Set the bibliographyfield in the document’s metadata to FILE, overriding any value set in the metadata. If you supply this argument multiple times, each FILE will be added to bibliography. If FILE is a URL, it will be fetched via HTTP. If FILE is not found relative to the working directory, it will be sought in the resource path (see --resource-path).

--csl=FILE

Set the csl field in the document’s metadata to FILE, overriding any value set in the metadata. (This is equivalent to --metadata csl=FILE.) If FILE is a URL, it will be fetched via HTTP. If FILE is not found relative to the working directory, it will be sought in the resource path (see --resource-path) and finally in the cslsubdirectory of the pandoc user data directory.

--citation-abbreviations=FILE

Set the citation-abbreviations field in the document’s metadata to FILE, overriding any value set in the metadata. (This is equivalent to --metadata citation-abbreviations=FILE.) If FILE is a URL, it will be fetched via HTTP. If FILE is not found relative to the working directory, it will be sought in the resource path (see --resource-path) and finally in the cslsubdirectory of the pandoc user data directory.

--natbib

Use natbib for citations in LaTeX output. This option is not for use with the --citeproc option or with PDF output. It is intended for use in producing a LaTeX file that can be processed with bibtex.

--biblatex

Use biblatex for citations in LaTeX output. This option is not for use with the --citeproc option or with PDF output. It is intended for use in producing a LaTeX file that can be processed with bibtex or biber.

Math rendering in HTML

The default is to render TeX math as far as possible using Unicode characters. Formulas are put inside a span with class="math", so that they may be styled differently from the surrounding text if needed. However, this gives acceptable results only for basic math, usually you will want to use --mathjax or another of the following options.

--mathjax[=URL]

Use MathJax to display embedded TeX math in HTML output. TeX math will be put between \(...\) (for inline math) or \[...\] (for display math) and wrapped in <span> tags with class math. Then the MathJax JavaScript will render it. The URL should point to the MathJax.js load script. If a URL is not provided, a link to the Cloudflare CDN will be inserted.

--mathml

Convert TeX math to MathML (in epub3, docbook4, docbook5, jats, html4 and html5). This is the default in odt output. MathML is supported natively by the main web browsers and select e-book readers.

--webtex[=URL]

Convert TeX formulas to <img> tags that link to an external script that converts formulas to images. The formula will be URL-encoded and concatenated with the URL provided. For SVG images you can for example use --webtex https://latex.codecogs.com/svg.latex?. If no URL is specified, the CodeCogs URL generating PNGs will be used (https://latex.codecogs.com/png.latex?). Note: the --webtex option will affect Markdown output as well as HTML, which is useful if you’re targeting a version of Markdown without native math support.

--katex[=URL]

Use KaTeX to display embedded TeX math in HTML output. The URL is the base URL for the KaTeX library. That directory should contain a katex.min.js and a katex.min.css file. If a URL is not provided, a link to the KaTeX CDN will be inserted.

--gladtex

Enclose TeX math in <eq> tags in HTML output. The resulting HTML can then be processed by GladTeX to produce SVG images of the typeset formulas and an HTML file with these images embedded.

    pandoc -s --gladtex input.md -o myfile.htex
gladtex -d image_dir myfile.htex
# produces myfile.html and images in image_dir

Options for wrapper scripts

--dump-args[=true|false]

Print information about command-line arguments to stdout, then exit. This option is intended primarily for use in wrapper scripts. The first line of output contains the name of the output file specified with the -ooption, or - (for stdout) if no output file was specified. The remaining lines contain the command-line arguments, one per line, in the order they appear. These do not include regular pandoc options and their arguments, but do include any options appearing after a -- separator at the end of the line.

--ignore-args[=true|false]

Ignore command-line arguments (for use in wrapper scripts). Regular pandoc options are not ignored. Thus, for example,

    pandoc --ignore-args -o foo.html -s foo.txt -- -e latin1

is equivalent to

    pandoc -o foo.html -s

Exit codes

If pandoc completes successfully, it will return exit code 0. Nonzero exit codes have the following meanings:

Code Error
1 PandocIOError
3 PandocFailOnWarningError
4 PandocAppError
5 PandocTemplateError
6 PandocOptionError
21 PandocUnknownReaderError
22 PandocUnknownWriterError
23 PandocUnsupportedExtensionError
24 PandocCiteprocError
25 PandocBibliographyError
31 PandocEpubSubdirectoryError
43 PandocPDFError
44 PandocXMLError
47 PandocPDFProgramNotFoundError
61 PandocHttpError
62 PandocShouldNeverHappenError
63 PandocSomeError
64 PandocParseError
66 PandocMakePDFError
67 PandocSyntaxMapError
83 PandocFilterError
84 PandocLuaError
89 PandocNoScriptingEngine
91 PandocMacroLoop
92 PandocUTF8DecodingError
93 PandocIpynbDecodingError
94 PandocUnsupportedCharsetError
97 PandocCouldNotFindDataFileError
98 PandocCouldNotFindMetadataFileError
99 PandocResourceNotFound

Defaults files

The --defaults option may be used to specify a package of options, in the form of a YAML file.

Fields that are omitted will just have their regular default values. So a defaults file can be as simple as one line:

    verbosity    :     INFO

In fields that expect a file path (or list of file paths), the following syntax may be used to interpolate environment variables:

    csl    :      ${HOME}/mycsldir/special.csl

${USERDATA} may also be used; this will always resolve to the user data directory that is current when the defaults file is parsed, regardless of the setting of the environment variable USERDATA.

${.} will resolve to the directory containing the defaults file itself. This allows you to refer to resources contained in that directory:

    epub-cover-image    :     ${.}/cover.jpg    
    epub-metadata    :     ${.}/meta.xml    
    resource-path    :    
    -     .                 # the working directory from which pandoc is run    
    -     ${.}/images       # the images subdirectory of the directory    
                    # containing this defaults file

This environment variable interpolation syntax _only_works in fields that expect file paths.

Defaults files can be placed in the defaults subdirectory of the user data directory and used from any directory. For example, one could create a file specifying defaults for writing letters, save it as letter.yaml in the defaults subdirectory of the user data directory, and then invoke these defaults from any directory using pandoc --defaults letter or pandoc -dletter.

When multiple defaults are used, their contents will be combined.

Note that, where command-line arguments may be repeated (--metadata-file, --css, --include-in-header, --include-before-body, --include-after-body, --variable, --metadata, --syntax-definition), the values specified on the command line will combine with values specified in the defaults file, rather than replacing them.

The following tables show the mapping between the command line and defaults file entries.

command line defaults file
``` ```
foo.md input-file : foo.md
``` ```
``` ```
foo.md bar.md input-files :
``` - foo.md
- bar.md
```

The value of input-files may be left empty to indicate input from stdin, and it can be an empty sequence [] for no input.

General options

command line defaults file
``` ```
--from markdown+emoji from : markdown+emoji
``` ```
```
reader : markdown+emoji
```
``` ```
--to markdown+hard_line_breaks to : markdown+hard_line_breaks
``` ```
```
writer : markdown+hard_line_breaks
```
``` ```
--output foo.pdf output-file : foo.pdf
``` ```
``` ```
--output - output-file :
``` ```
``` ```
--data-dir dir data-dir : dir
``` ```
``` ```
--defaults file defaults :
``` - file
```
``` ```
--verbose verbosity : INFO
``` ```
``` ```
--quiet verbosity : ERROR
``` ```
``` ```
--fail-if-warnings fail-if-warnings : true
``` ```
``` ```
--sandbox sandbox : true
``` ```
``` ```
--log=FILE log-file : FILE
``` ```

Options specified in a defaults file itself always have priority over those in another file included with a defaults: entry.

verbosity can have the values ERROR, WARNING, or INFO.

Reader options

command line defaults file
``` ```
--shift-heading-level-by -1 shift-heading-level-by : -1
``` ```
``` ```
--indented-code-classes python indented-code-classes :
``` - python
```
``` ```
--default-image-extension ".jpg" default-image-extension : '.jpg'
``` ```
``` ```
--file-scope file-scope : true
``` ```
``` ```
--citeproc   filters :
--lua-filter count-words.lua   - citeproc
--filter special.lua - count-words.lua
``` - type : json
path : special.lua
```
``` ```
--metadata key=value   metadata :
--metadata key2 key : value
``` key2 : true
```
``` ```
--metadata-file meta.yaml metadata-files :
``` - meta.yaml
```
```
metadata-file : meta.yaml
```
``` ```
--preserve-tabs preserve-tabs : true
``` ```
``` ```
--tab-stop 8 tab-stop : 8
``` ```
``` ```
--track-changes accept track-changes : accept
``` ```
``` ```
--extract-media dir extract-media : dir
``` ```
``` ```
--abbreviations abbrevs.txt abbreviations : abbrevs.txt
``` ```
``` ```
--trace trace : true
``` ```

Metadata values specified in a defaults file are parsed as literal string text, not Markdown.

Filters will be assumed to be Lua filters if they have the .lua extension, and JSON filters otherwise. But the filter type can also be specified explicitly, as shown. Filters are run in the order specified. To include the built-in citeproc filter, use either citeproc or {type: citeproc}.

General writer options

command line defaults file
``` ```
--standalone standalone : true
``` ```
``` ```
--template letter template : letter
``` ```
``` ```
--variable key=val   variables :
--variable key2 key : val
``` key2 : true
```
``` ```
--eol nl eol : nl
``` ```
``` ```
--dpi 300 dpi : 300
``` ```
``` ```
--wrap 60 wrap : 60
``` ```
``` ```
--columns 72 columns : 72
``` ```
``` ```
--table-of-contents table-of-contents : true
``` ```
``` ```
--toc toc : true
``` ```
``` ```
--toc-depth 3 toc-depth : 3
``` ```
``` ```
--strip-comments strip-comments : true
``` ```
``` ```
--no-highlight highlight-style : null
``` ```
``` ```
--highlight-style kate highlight-style : kate
``` ```
``` ```
--syntax-definition mylang.xml syntax-definitions :
``` - mylang.xml
```
```
syntax-definition : mylang.xml
```
``` ```
--include-in-header inc.tex include-in-header :
``` - inc.tex
```
``` ```
--include-before-body inc.tex include-before-body :
``` - inc.tex
```
``` ```
--include-after-body inc.tex include-after-body :
``` - inc.tex
```
``` ```
--resource-path .:foo resource-path : [ '.' , 'foo' ]
``` ```
``` ```
--request-header foo:bar request-headers :
``` - [ "User-Agent" , "Mozilla/5.0" ]
```
``` ```
--no-check-certificate no-check-certificate : true
``` ```

Options affecting specific writers

command line defaults file
``` ```
--self-contained self-contained : true
``` ```
``` ```
--html-q-tags html-q-tags : true
``` ```
``` ```
--ascii ascii : true
``` ```
``` ```
--reference-links reference-links : true
``` ```
``` ```
--reference-location block reference-location : block
``` ```
``` ```
--markdown-headings atx markdown-headings : atx
``` ```
``` ```
--list-tables list-tables : true
``` ```
``` ```
--top-level-division chapter top-level-division : chapter
``` ```
``` ```
--number-sections number-sections : true
``` ```
``` ```
--number-offset=1,4 number-offset : [1,4]
``` ```
``` ```
--listings listings : true
``` ```
``` ```
--incremental incremental : true
``` ```
``` ```
--slide-level 2 slide-level : 2
``` ```
``` ```
--section-divs section-divs : true
``` ```
``` ```
--email-obfuscation references email-obfuscation : references
``` ```
``` ```
--id-prefix ch1 identifier-prefix : ch1
``` ```
``` ```
--title-prefix MySite title-prefix : MySite
``` ```
``` ```
--css styles/screen.css   css :
--css styles/special.css - styles/screen.css
``` - styles/special.css
```
``` ```
--reference-doc my.docx reference-doc : my.docx
``` ```
``` ```
--epub-cover-image cover.jpg epub-cover-image : cover.jpg
``` ```
``` ```
--epub-title-page=false epub-title-page : false
``` ```
``` ```
--epub-metadata meta.xml epub-metadata : meta.xml
``` ```
``` ```
--epub-embed-font special.otf   epub-fonts :
--epub-embed-font headline.otf - special.otf
``` - headline.otf
```
``` ```
--split-level 2 split-level : 2
``` ```
``` ```
--chunk-template="%i.html" chunk-template : "%i.html"
``` ```
``` ```
--epub-subdirectory="" epub-subdirectory : ''
``` ```
``` ```
--ipynb-output best ipynb-output : best
``` ```
``` ```
--pdf-engine xelatex pdf-engine : xelatex
``` ```
``` ```
--pdf-engine-opt=--shell-escape pdf-engine-opts :
``` - '-shell-escape'
```
```
pdf-engine-opt : '-shell-escape'
```

Citation rendering

command line defaults file
``` ```
--citeproc citeproc : true
``` ```
``` ```
--bibliography logic.bib bibliography : logic.bib
``` ```
``` ```
--csl ieee.csl csl : ieee.csl
``` ```
``` ```
--citation-abbreviations ab.json citation-abbreviations : ab.json
``` ```
``` ```
--natbib cite-method : natbib
``` ```
``` ```
--biblatex cite-method : biblatex
``` ```

cite-method can be citeproc, natbib, or biblatex. This only affects LaTeX output. If you want to use citeproc to format citations, you should also set ‘citeproc: true’.

If you need control over when the citeproc processing is done relative to other filters, you should instead use citeproc in the list of filters (see Reader options).

Math rendering in HTML

command line defaults file
``` ```
--mathjax html-math-method :
``` method : mathjax
```
``` ```
--mathml html-math-method :
``` method : mathml
```
``` ```
--webtex html-math-method :
``` method : webtex
```
``` ```
--katex html-math-method :
``` method : katex
```
``` ```
--gladtex html-math-method :
``` method : gladtex
```

In addition to the values listed above, method can have the value plain.

If the command line option accepts a URL argument, an url: field can be added to html-math-method:.

Options for wrapper scripts

command line defaults file
``` ```
--dump-args dump-args : true
``` ```
``` ```
--ignore-args ignore-args : true
``` ```

Templates

When the -s/--standalone option is used, pandoc uses a template to add header and footer material that is needed for a self-standing document. To see the default template that is used, just type

    pandoc -D *FORMAT*

where FORMAT is the name of the output format. A custom template can be specified using the --template option. You can also override the system default templates for a given output format FORMAT by putting a file templates/default.*FORMAT* in the user data directory (see --data-dir, above). Exceptions:

Templates contain variables, which allow for the inclusion of arbitrary information at any point in the file. They may be set at the command line using the -V/--variable option. If a variable is not set, pandoc will look for the key in the document’s metadata, which can be set using either YAML metadata blocks or with the -M/--metadata option. In addition, some variables are given default values by pandoc. See Variables below for a list of variables used in pandoc’s default templates.

If you use custom templates, you may need to revise them as pandoc changes. We recommend tracking the changes in the default templates, and modifying your custom templates accordingly. An easy way to do this is to fork the pandoc-templatesrepository and merge in changes after each pandoc release.

Template syntax

Delimiters

To mark variables and control structures in the template, either $…$ or ${…} may be used as delimiters. The styles may also be mixed in the same template, but the opening and closing delimiter must match in each case. The opening delimiter may be followed by one or more spaces or tabs, which will be ignored. The closing delimiter may be preceded by one or more spaces or tabs, which will be ignored.

To include a literal $in the document, use $$.

Interpolated variables

A slot for an interpolated variable is a variable name surrounded by matched delimiters. Variable names must begin with a letter and can contain letters, numbers, _, -, and .. The keywords it, if, else, endif, for, sep, and endfor may not be used as variable names. Examples:

    $foo$
$foo.bar.baz$
$foo_bar.baz-bim$
$ foo $
${foo}
${foo.bar.baz}
${foo_bar.baz-bim}
${ foo }

Variable names with periods are used to get at structured variable values. So, for example, employee.salary will return the value of the salary field of the object that is the value of the employee field.

Conditionals

A conditional begins with if(variable) (enclosed in matched delimiters) and ends with endif (enclosed in matched delimiters). It may optionally contain an else (enclosed in matched delimiters). The ifsection is used if variable has a true value, otherwise the elsesection is used (if present). The following values count as true:

Note that in YAML metadata (and metadata specified on the command line using -M/--metadata), unquoted true and false will be interpreted as Boolean values. But a variable specified on the command line using -V/--variable will always be given a string value. Hence a conditional if(foo) will be triggered if you use -V foo=false, but not if you use -M foo=false.

Examples:

    $if(foo)$bar$endif$

$if(foo)$
  $foo$
$endif$

$if(foo)$
part one
$else$
part two
$endif$

${if(foo)}bar${endif}

${if(foo)}
  ${foo}
${endif}

${if(foo)}
${ foo.bar }
${else}
no foo!
${endif}

The keyword elseif may be used to simplify complex nested conditionals:

    $if(foo)$
XXX
$elseif(bar)$
YYY
$else$
ZZZ
$endif$

For loops

A for loop begins with for(variable) (enclosed in matched delimiters) and ends with endfor (enclosed in matched delimiters).

Examples:

    $for(foo)$$foo$$sep$, $endfor$

$for(foo)$
  - $foo.last$, $foo.first$
$endfor$

${ for(foo.bar) }
  - ${ foo.bar.last }, ${ foo.bar.first }
${ endfor }

$for(mymap)$
$it.name$: $it.office$
$endfor$

You may optionally specify a separator between consecutive values using sep(enclosed in matched delimiters). The material between sep and the endfor is the separator.

    ${ for(foo) }${ foo }${ sep }, ${ endfor }

Instead of using variable inside the loop, the special anaphoric keyword it may be used.

    ${ for(foo.bar) }
  - ${ it.last }, ${ it.first }
${ endfor }

Partials

Partials (subtemplates stored in different files) may be included by using the name of the partial, followed by (), for example:

    ${ styles() }

Partials will be sought in the directory containing the main template. The file name will be assumed to have the same extension as the main template if it lacks an extension. When calling the partial, the full name including file extension can also be used:

    ${ styles.html() }

(If a partial is not found in the directory of the template and the template path is given as a relative path, it will also be sought in the templatessubdirectory of the user data directory.)

Partials may optionally be applied to variables using a colon:

    ${ date:fancy() }

${ articles:bibentry() }

If articles is an array, this will iterate over its values, applying the partial bibentry() to each one. So the second example above is equivalent to

    ${ for(articles) }
${ it:bibentry() }
${ endfor }

Note that the anaphoric keyword it must be used when iterating over partials. In the above examples, the bibentry partial should contain it.title (and so on) instead of articles.title.

Final newlines are omitted from included partials.

Partials may include other partials.

A separator between values of an array may be specified in square brackets, immediately after the variable name or partial:

    ${months[, ]}$

${articles:bibentry()[; ]$

The separator in this case is literal and (unlike with sep in an explicit for loop) cannot contain interpolated variables or other template directives.

Nesting

To ensure that content is “nested,” that is, subsequent lines indented, use the ^directive:

    $item.number$  $^$$item.description$ ($item.price$)

In this example, if item.description has multiple lines, they will all be indented to line up with the first line:

    00123  A fine bottle of 18-year old
       Oban whiskey. ($148)

To nest multiple lines to the same level, align them with the ^ directive in the template. For example:

    $item.number$  $^$$item.description$ ($item.price$)
               (Available til $item.sellby$.)

will produce

    00123  A fine bottle of 18-year old
       Oban whiskey. ($148)
       (Available til March 30, 2020.)

If a variable occurs by itself on a line, preceded by whitespace and not followed by further text or directives on the same line, and the variable’s value contains multiple lines, it will be nested automatically.

Breakable spaces

Normally, spaces in the template itself (as opposed to values of the interpolated variables) are not breakable, but they can be made breakable in part of the template by using the ~ keyword (ended with another ~).

    $~$This long line may break if the document is rendered
with a short line length.$~$

Pipes

A pipe transforms the value of a variable or partial. Pipes are specified using a slash (/) between the variable name (or partial) and the pipe name. Example:

    $for(name)$
$name/uppercase$
$endfor$

$for(metadata/pairs)$
- $it.key$: $it.value$
$endfor$

$employee:name()/uppercase$

Pipes may be chained:

    $for(employees/pairs)$
$it.key/alpha/uppercase$. $it.name$
$endfor$

Some pipes take parameters:

    |----------------------|------------|
$for(employee)$
$it.name.first/uppercase/left 20 "| "$$it.name.salary/right 10 " | " " |"$
$endfor$
|----------------------|------------|

Currently the following pipes are predefined:

Variables

Metadata variables

title, author, date

allow identification of basic aspects of the document. Included in PDF metadata through LaTeX and ConTeXt. These can be set through a pandoc title block, which allows for multiple authors, or through a YAML metadata block:

    ---
author:
- Aristotle
- Peter Abelard
...

Note that if you just want to set PDF or HTML metadata, without including a title block in the document itself, you can set the title-meta, author-meta, and date-meta variables. (By default these are set automatically, based on title, author, and date.) The page title in HTML is set by pagetitle, which is equal to titleby default.

subtitle document subtitle, included in HTML, EPUB, LaTeX, ConTeXt, and docx documents abstract document summary, included in HTML, LaTeX, ConTeXt, AsciiDoc, and docx documents abstract-title title of abstract, currently used only in HTML, EPUB, and docx. This will be set automatically to a localized value, depending on lang, but can be manually overridden. keywords list of keywords to be included in HTML, PDF, ODT, pptx, docx and AsciiDoc metadata; repeat as for author, above subject document subject, included in ODT, PDF, docx, EPUB, and pptx metadata description document description, included in ODT, docx and pptx metadata. Some applications show this as Comments metadata. category document category, included in docx and pptx metadata

Additionally, any root-level string metadata, not included in ODT, docx or pptx metadata is added as a custom property. The following YAML metadata block for instance:

    ---
title:  'This is the title'
subtitle: "This is the subtitle"
author:
- Author One
- Author Two
description: |
    This is a long
    description.

    It consists of two paragraphs
...

will include title, author and description as standard document properties and subtitle as a custom property when converting to docx, ODT or pptx.

Language variables

lang

identifies the main language of the document using IETF language tags (following the BCP 47 standard), such as en or en-GB. The Language subtag lookup tool can look up or verify these tags. This affects most formats, and controls hyphenation in PDF output when using LaTeX (through babel and polyglossia) or ConTeXt.

Use native pandoc Divs and Spanswith the lang attribute to switch the language:

    ---
lang: en-GB
...

Text in the main document language (British English).

::: {lang=fr-CA}
> Cette citation est écrite en français canadien.
:::

More text in English. ['Zitat auf Deutsch.']{lang=de}

dir

the base script direction, either rtl (right-to-left) or ltr (left-to-right).

For bidirectional documents, native pandoc spans and divs with the dir attribute (value rtl or ltr) can be used to override the base direction in some output formats. This may not always be necessary if the final renderer (e.g. the browser, when generating HTML) supports the Unicode Bidirectional Algorithm.

When using LaTeX for bidirectional documents, only the xelatex engine is fully supported (use --pdf-engine=xelatex).

Variables for HTML

document-css Enables inclusion of most of the CSSin the styles.html partial (have a look with pandoc --print-default-data-file=templates/styles.html). Unless you use --css, this variable is set to true by default. You can disable it with e.g.pandoc -M document-css=false. mainfont sets the CSS font-familyproperty on the htmlelement. fontsize sets the base CSS font-size, which you’d usually set to e.g.20px, but it also accepts pt (12pt = 16px in most browsers). fontcolor sets the CSS colorproperty on the htmlelement. linkcolor sets the CSS colorproperty on all links. monofont sets the CSS font-familyproperty on codeelements. monobackgroundcolor sets the CSS background-color property on code elements and adds extra padding. linestretch sets the CSS line-heightproperty on the htmlelement, which is preferred to be unitless. maxwidth sets the CSS max-widthproperty (default is 32em). backgroundcolor sets the CSS background-color property on the html element. margin-left, margin-right, margin-top, margin-bottom sets the corresponding CSS padding properties on the body element.

To override or extend some CSSfor just one document, include for example:

    ---
header-includes: |
  <style>
  blockquote {
    font-style: italic;
  }
  tr.even {
    background-color: #f0f0f0;
  }
  td, th {
    padding: 0.5em 2em 0.5em 0.5em;
  }
  tbody {
    border-bottom: none;
  }
  </style>
---

Variables for HTML math

classoption when using --katex, you can render display math equations flush left using YAML metadata or with -M classoption=fleqn.

Variables for HTML slides

These affect HTML output when producing slide shows with pandoc.

institute author affiliations: can be a list when there are multiple authors revealjs-url base URL for reveal.js documents (defaults to https://unpkg.com/reveal.js@^4/) s5-url base URL for S5 documents (defaults to s5/default) slidy-url base URL for Slidy documents (defaults to https://www.w3.org/Talks/Tools/Slidy2) slideous-url base URL for Slideous documents (defaults to slideous) title-slide-attributes additional attributes for the title slide of reveal.js slide shows. See background in reveal.js, beamer, and pptx for an example.

All reveal.js configuration options are available as variables. To turn off boolean flags that default to true in reveal.js, use 0.

Variables for Beamer slides

These variables change the appearance of PDF slides using beamer.

aspectratio slide aspect ratio (43for 4:3 [default], 169for 16:9, 1610 for 16:10, 149 for 14:9, 141 for 1.41:1, 54 for 5:4, 32 for 3:2) beameroption add extra beamer option with \setbeameroption{} institute author affiliations: can be a list when there are multiple authors logo logo image for slides navigation controls navigation symbols (default is empty for no navigation symbols; other valid values are frame, vertical, and horizontal) section-titles enables “title pages” for new sections (default is true) theme, colortheme, fonttheme, innertheme, outertheme beamer themes themeoptions options for LaTeX beamer themes (a list). titlegraphic image for title slide titlegraphicoptions options for title slide image

Variables for PowerPoint

These variables control the visual aspects of a slide show that are not easily controlled via templates.

monofont font to use for code.

Variables for LaTeX

Pandoc uses these variables when creating a PDF with a LaTeX engine.

Layout

block-headings

make \paragraph and \subparagraph (fourth- and fifth-level headings, or fifth- and sixth-level with book classes) free-standing rather than run-in; requires further formatting to distinguish from \subsubsection (third- or fourth-level headings). Instead of using this option, KOMA-Script can adjust headings more extensively:

    ---
documentclass: scrartcl
header-includes: |
  \RedeclareSectionCommand[
    beforeskip=-10pt plus -2pt minus -1pt,
    afterskip=1sp plus -1sp minus 1sp,
    font=\normalfont\itshape]{paragraph}
  \RedeclareSectionCommand[
    beforeskip=-10pt plus -2pt minus -1pt,
    afterskip=1sp plus -1sp minus 1sp,
    font=\normalfont\scshape,
    indent=0pt]{subparagraph}
...

classoption

option for document class, e.g.oneside; repeat for multiple options:

    ---
classoption:
- twocolumn
- landscape
...

documentclass document class: usually one of the standard classes, article, book, and report; the KOMA-Scriptequivalents, scrartcl, scrbook, and scrreprt, which default to smaller margins; or memoir geometry

option for geometry package, e.g.margin=1in; repeat for multiple options:

    ---
geometry:
- top=30mm
- left=20mm
- heightrounded
...

hyperrefoptions

option for hyperref package, e.g.linktoc=all; repeat for multiple options:

    ---
hyperrefoptions:
- linktoc=all
- pdfwindowui
- pdfpagemode=FullScreen
...

indent if true, pandoc will use document class settings for indentation (the default LaTeX template otherwise removes indentation and adds space between paragraphs) linestretch adjusts line spacing using the setspace package, e.g.1.25, 1.5 margin-left, margin-right, margin-top, margin-bottom sets margins if geometryis not used (otherwise geometry overrides these) pagestyle control \pagestyle{}: the default article class supports plain (default), empty (no running heads or page numbers), and headings(section titles in running heads) papersize paper size, e.g.letter, a4 secnumdepth numbering depth for sections (with --number-sections option or numbersections variable) beamerarticle produce an article from Beamer slides handout produce a handout version of Beamer slides (with overlays condensed into single slides)

Fonts

fontenc allows font encoding to be specified through fontenc package (with pdflatex); default is T1 (see LaTeX font encodings guide) fontfamily font package for use with pdflatex: TeX Live includes many options, documented in the LaTeX Font Catalogue. The default is Latin Modern. fontfamilyoptions

options for package used as fontfamily; repeat for multiple options. For example, to use the Libertine font with proportional lowercase (old-style) figures through the libertinus package:

    ---
fontfamily: libertinus
fontfamilyoptions:
- osf
- p
...

fontsize font size for body text. The standard classes allow 10pt, 11pt, and 12pt. To use another size, set documentclass to one of the KOMA-Script classes, such as scrartcl or scrbook. mainfont, sansfont, monofont, mathfont, CJKmainfont, CJKsansfont, CJKmonofont font families for use with xelatex or lualatex: take the name of any system font, using the fontspec package. CJKmainfont uses the xecjk package. mainfontoptions, sansfontoptions, monofontoptions, mathfontoptions, CJKoptions

options to use with mainfont, sansfont, monofont, mathfont, CJKmainfont in xelatex and lualatex. Allow for any choices available through fontspec; repeat for multiple options. For example, to use the TeX Gyre version of Palatino with lowercase figures:

    ---
mainfont: TeX Gyre Pagella
mainfontoptions:
- Numbers=Lowercase
- Numbers=Proportional
...

mainfontfallback, sansfontfallback, monofontfallback

fonts to try if a glyph isn’t found in mainfont, sansfont, or monofont respectively. These are lists. The font name must be followed by a colon and optionally a set of options, for example:

    ---
mainfontfallback:
  - "FreeSans:"
  - "NotoColorEmoji:mode=harf"
...

Font fallbacks currently only work with lualatex.

babelfonts

a map of Babel language names (e.g.chinese) to the font to be used with the language:

    ---
babelfonts:
  chinese-hant: "Noto Serif CJK TC"
  russian: "Noto Serif"
...

microtypeoptions options to pass to the microtype package

Links

colorlinks add color to link text; automatically enabled if any of linkcolor, filecolor, citecolor, urlcolor, or toccolor are set boxlinks add visible box around links (has no effect if colorlinks is set) linkcolor, filecolor, citecolor, urlcolor, toccolor color for internal links, external links, citation links, linked URLs, and links in table of contents, respectively: uses options allowed by xcolor, including the dvipsnames, svgnames, and x11names lists links-as-notes causes links to be printed as footnotes urlstyle style for URLs (e.g., tt, rm, sf, and, the default, same)

Front matter

lof, lot include list of figures, list of tables thanks contents of acknowledgments footnote after document title toc include table of contents (can also be set using --toc/--table-of-contents) toc-depth level of section to include in table of contents

BibLaTeX Bibliographies

These variables function when using BibLaTeX for citation rendering.

biblatexoptions list of options for biblatex biblio-style bibliography style, when used with --natbib and --biblatex biblio-title bibliography title, when used with --natbib and --biblatex bibliography bibliography to use for resolving references natbiboptions list of options for natbib

Variables for ConTeXt

Pandoc uses these variables when creating a PDF with ConTeXt.

fontsize font size for body text (e.g.10pt, 12pt) headertext, footertext text to be placed in running header or footer (see ConTeXt Headers and Footers); repeat up to four times for different placement indenting controls indentation of paragraphs, e.g.yes,small,next (see ConTeXt Indentation); repeat for multiple options interlinespace adjusts line spacing, e.g.4ex (using setupinterlinespace); repeat for multiple options layout options for page margins and text arrangement (see ConTeXt Layout); repeat for multiple options linkcolor, contrastcolor color for links outside and inside a page, e.g.red, blue (see ConTeXt Color) linkstyle typeface style for links, e.g.normal, bold, slanted, boldslanted, type, cap, small lof, lot include list of figures, list of tables mainfont, sansfont, monofont, mathfont font families: take the name of any system font (see ConTeXt Font Switching) mainfontfallback, sansfontfallback, monofontfallback list of fonts to try, in order, if a glyph is not found in the main font. Use \definefallbackfamily-compatible font name syntax. Emoji fonts are unsupported. margin-left, margin-right, margin-top, margin-bottom sets margins, if layoutis not used (otherwise layout overrides these) pagenumbering page number style and location (using setuppagenumbering); repeat for multiple options papersize paper size, e.g.letter, A4, landscape (see ConTeXt Paper Setup); repeat for multiple options pdfa adds to the preamble the setup necessary to generate PDF/A of the type specified, e.g.1a:2005, 2a. If no type is specified (i.e. the value is set to True, by e.g. --metadata=pdfa or pdfa: true in a YAML metadata block), 1b:2005 will be used as default, for reasons of backwards compatibility. Using --variable=pdfa without specified value is not supported. To successfully generate PDF/A the required ICC color profiles have to be available and the content and all included files (such as images) have to be standard-conforming. The ICC profiles and output intent may be specified using the variables pdfaiccprofile and pdfaintent. See also ConTeXt PDFA for more details. pdfaiccprofile when used in conjunction with pdfa, specifies the ICC profile to use in the PDF, e.g.default.cmyk. If left unspecified, sRGB.icc is used as default. May be repeated to include multiple profiles. Note that the profiles have to be available on the system. They can be obtained from ConTeXt ICC Profiles. pdfaintent when used in conjunction with pdfa, specifies the output intent for the colors, e.g.ISO coated v2 300\letterpercent\space (ECI)If left unspecified, sRGB IEC61966-2.1 is used as default. toc include table of contents (can also be set using --toc/--table-of-contents) urlstyle typeface style for links without link text, e.g.normal, bold, slanted, boldslanted, type, cap, small whitespace spacing between paragraphs, e.g.none, small (using setupwhitespace) includesource include all source documents as file attachments in the PDF file

Variables for wkhtmltopdf

Pandoc uses these variables when creating a PDF with wkhtmltopdf. The --css option also affects the output.

footer-html, header-html add information to the header and footer margin-left, margin-right, margin-top, margin-bottom set the page margins papersize sets the PDF paper size

Variables for man pages

adjusting adjusts text to left (l), right (r), center (c), or both (b) margins footer footer in man pages header header in man pages section section number in man pages

Variables for Texinfo

version version of software (used in title and title page) filename name of info file to be generated (defaults to a name based on the texi filename)

Variables for Typst

margin A dictionary with the fields defined in the Typst documentation: x, y, top, bottom, left, right. papersize Paper size: a4, us-letter, etc. mainfont Name of system font to use for the main font. fontsize Font size (e.g., 12pt). section-numbering Schema to use for numbering sections, e.g.1.A.1. columns Number of columns for body text.

Variables for ms

fontfamily A (Avant Garde), B (Bookman), C (Helvetica), HN (Helvetica Narrow), P (Palatino), or T (Times New Roman). This setting does not affect source code, which is always displayed using monospace Courier. These built-in fonts are limited in their coverage of characters. Additional fonts may be installed using the script install-font.sh provided by Peter Schaffter and documented in detail on his web site. indent paragraph indent (e.g.2m) lineheight line height (e.g.12p) pointsize point size (e.g.10p)

Variables set automatically

Pandoc sets these variables automatically in response to options or document contents; users can also modify them. These vary depending on the output format, and include the following:

body body of document date-meta the date variable converted to ISO 8601 YYYY-MM-DD, included in all HTML based formats (dzslides, epub, html, html4, html5, revealjs, s5, slideous, slidy). The recognized formats for date are: mm/dd/yyyy, mm/dd/yy, yyyy-mm-dd (ISO 8601), dd MM yyyy (e.g. either 02 Apr 2018 or 02 April 2018), MM dd, yyyy (e.g.Apr. 02, 2018 or `April 02, 2018),yyyy[mm[dd]](e.g.20180402,201804or2018`). header-includes contents specified by -H/--include-in-header (may have multiple values) include-before contents specified by -B/--include-before-body(may have multiple values) include-after contents specified by -A/--include-after-body(may have multiple values) meta-json JSON representation of all of the document’s metadata. Field values are transformed to the selected output format. numbersections non-null value if -N/--number-sections was specified sourcefile, outputfile

source and destination filenames, as given on the command line. sourcefile can also be a list if input comes from multiple files, or empty if input is from stdin. You can use the following snippet in your template to distinguish them:

    $if(sourcefile)$
$for(sourcefile)$
$sourcefile$
$endfor$
$else$
(stdin)
$endif$

Similarly, outputfilecan be - if output goes to the terminal.

If you need absolute paths, use e.g.$curdir$/$sourcefile$.

curdir working directory from which pandoc is run. pandoc-version pandoc version. toc non-null value if --toc/--table-of-contentswas specified toc-title title of table of contents (works only with EPUB, HTML, revealjs, opendocument, odt, docx, pptx, beamer, LaTeX). Note that in docx and pptx a custom toc-title will be picked up from metadata, but cannot be set as a variable.

Extensions

The behavior of some of the readers and writers can be adjusted by enabling or disabling various extensions.

An extension can be enabled by adding +EXTENSION to the format name and disabled by adding -EXTENSION. For example, --from markdown_strict+footnotesis strict Markdown with footnotes enabled, while --from markdown-footnotes-pipe_tablesis pandoc’s Markdown without footnotes or pipe tables.

The Markdown reader and writer make by far the most use of extensions. Extensions only used by them are therefore covered in the section Pandoc’s Markdownbelow (see Markdown variants for commonmark and gfm). In the following, extensions that also work for other formats are covered.

Note that Markdown extensions added to the ipynb format affect Markdown cells in Jupyter notebooks (as do command-line options like --markdown-headings).

Typography

Extension: smart

Interpret straight quotes as curly quotes, --- as em-dashes, -- as en-dashes, and ... as ellipses. Nonbreaking spaces are inserted after certain abbreviations, such as “Mr.”

This extension can be enabled/disabled for the following formats:

input formats markdown, commonmark, latex, mediawiki, org, rst, twiki, html output formats markdown, latex, context, rst enabled by default in markdown, latex, context (both input and output)

Note: If you are writing Markdown, then the smart extension has the reverse effect: what would have been curly quotes comes out straight.

In LaTeX, smart means to use the standard TeX ligatures for quotation marks (```` and '' for double quotes, ``` and ' for single quotes) and dashes (-- for en-dash and --- for em-dash). If smart is disabled, then in reading LaTeX pandoc will parse these characters literally. In writing LaTeX, enabling smart tells pandoc to use the ligatures when possible; if smart is disabled pandoc will use unicode quotation mark and dash characters.

Headings and sections

Extension: auto_identifiers

A heading without an explicitly specified identifier will be automatically assigned a unique identifier based on the heading text.

This extension can be enabled/disabled for the following formats:

input formats markdown, latex, rst, mediawiki, textile output formats markdown, muse enabled by default in markdown, muse

The default algorithm used to derive the identifier from the heading text is:

Thus, for example,

Heading Identifier
Heading identifiers in HTML heading-identifiers-in-html
Maître d'hôtel maître-dhôtel
*Dogs*?--in *my* house? dogs--in-my-house
[HTML], [S5], or [RTF]? html-s5-or-rtf
3. Applications applications
33 section

These rules should, in most cases, allow one to determine the identifier from the heading text. The exception is when several headings have the same text; in this case, the first will get an identifier as described above; the second will get the same identifier with -1appended; the third with -2; and so on.

(However, a different algorithm is used if gfm_auto_identifiers is enabled; see below.)

These identifiers are used to provide link targets in the table of contents generated by the --toc|--table-of-contentsoption. They also make it easy to provide links from one section of a document to another. A link to this section, for example, might look like this:

    See the section on
[heading identifiers](#heading-identifiers-in-html-latex-and-context).

Note, however, that this method of providing links to sections works only in HTML, LaTeX, and ConTeXt formats.

If the --section-divs option is specified, then each section will be wrapped in a section (or a div, if html4 was specified), and the identifier will be attached to the enclosing <section> (or <div>) tag rather than the heading itself. This allows entire sections to be manipulated using JavaScript or treated differently in CSS.

Extension: ascii_identifiers

Causes the identifiers produced by auto_identifiers to be pure ASCII. Accents are stripped off of accented Latin letters, and non-Latin letters are omitted.

Extension: gfm_auto_identifiers

Changes the algorithm used by auto_identifiers to conform to GitHub’s method. Spaces are converted to dashes (-), uppercase characters to lowercase characters, and punctuation characters other than - and _ are removed. Emojis are replaced by their names.

Math Input

The extensions tex_math_dollars, tex_math_gfm, tex_math_single_backslash, and tex_math_double_backslashare described in the section about Pandoc’s Markdown.

However, they can also be used with HTML input. This is handy for reading web pages formatted using MathJax, for example.

Raw HTML/TeX

The following extensions are described in more detail in their respective sections of Pandoc’s Markdown:

input formats latex, textile, html (environments, \ref, and \eqref only), ipynb output formats textile, commonmark

Note: as applied to ipynb, raw_html and raw_tex affect not only raw TeX in Markdown cells, but data with mime type text/html in output cells. Since the ipynb reader attempts to preserve the richest possible outputs when several options are given, you will get best results if you disable raw_html and raw_tex when converting to formats like docx which don’t allow raw html or tex.

Literate Haskell support

Extension: literate_haskell

Treat the document as literate Haskell source.

This extension can be enabled/disabled for the following formats:

input formats markdown, rst, latex output formats markdown, rst, latex, html

If you append +lhs (or +literate_haskell) to one of the formats above, pandoc will treat the document as literate Haskell source. This means that

Examples:

    pandoc -f markdown+lhs -t html

reads literate Haskell source formatted with Markdown conventions and writes ordinary HTML (without bird tracks).

    pandoc -f markdown+lhs -t html+lhs

writes HTML with the Haskell code in bird tracks, so it can be copied and pasted as literate Haskell source.

Note that GHC expects the bird tracks in the first column, so indented literate code blocks (e.g. inside an itemized environment) will not be picked up by the Haskell compiler.

Other extensions

Extension: empty_paragraphs

Allows empty paragraphs. By default empty paragraphs are omitted.

This extension can be enabled/disabled for the following formats:

input formats docx, html output formats docx, odt, opendocument, html, latex

Extension: native_numbering

Enables native numbering of figures and tables. Enumeration starts at 1.

This extension can be enabled/disabled for the following formats:

output formats odt, opendocument, docx

Extension: xrefs_name

Links to headings, figures and tables inside the document are substituted with cross-references that will use the name or caption of the referenced item. The original link text is replaced once the generated document is refreshed. This extension can be combined with xrefs_number in which case numbers will appear before the name.

Text in cross-references is only made consistent with the referenced item once the document has been refreshed.

This extension can be enabled/disabled for the following formats:

output formats odt, opendocument

Extension: xrefs_number

Links to headings, figures and tables inside the document are substituted with cross-references that will use the number of the referenced item. The original link text is discarded. This extension can be combined with xrefs_name in which case the name or caption numbers will appear after the number.

For the xrefs_numberto be useful heading numbers must be enabled in the generated document, also table and figure captions must be enabled using for example the native_numbering extension.

Numbers in cross-references are only visible in the final document once it has been refreshed.

This extension can be enabled/disabled for the following formats:

output formats odt, opendocument

Extension: styles

When converting from docx, read all docx styles as divs (for paragraph styles) and spans (for character styles) regardless of whether pandoc understands the meaning of these styles. This can be used with docx custom styles. Disabled by default.

input formats docx

Extension: amuse

In the muse input format, this enables Text::Amuse extensions to Emacs Muse markup.

Extension: raw_markdown

In the ipynb input format, this causes Markdown cells to be included as raw Markdown blocks (allowing lossless round-tripping) rather than being parsed. Use this only when you are targeting ipynb or a Markdown-based output format.

Extension: citations

When the citationsextension is enabled in org, org-cite and org-ref style citations will be parsed as native pandoc citations.

When citations is enabled in docx, citations inserted by Zotero or Mendeley or EndNote plugins will be parsed as native pandoc citations. (Otherwise, the formatted citations generated by the bibliographic software will be parsed as regular text.)

Extension: fancy_lists

Some aspects of Pandoc’s Markdown fancy lists are also accepted in org input, mimicking the option org-list-allow-alphabetical in Emacs. As in Org Mode, enabling this extension allows lowercase and uppercase alphabetical markers for ordered lists to be parsed in addition to arabic ones. Note that for Org, this does not include roman numerals or the # placeholder that are enabled by the extension in Pandoc’s Markdown.

Extension: element_citations

In the jats output formats, this causes reference items to be replaced with <element-citation>elements. These elements are not influenced by CSL styles, but all information on the item is included in tags.

Extension: ntb

In the context output format this enables the use of Natural Tables (TABLE) instead of the default Extreme Tables (xtables). Natural tables allow more fine-grained global customization but come at a performance penalty compared to extreme tables.

Extension: tagging

Enabling this extension with context output will produce markup suitable for the production of tagged PDFs. This includes additional markers for paragraphs and alternative markup for emphasized text. The emphasis-command template variable is set if the extension is enabled.

Pandoc’s Markdown

Pandoc understands an extended and slightly revised version of John Gruber’s Markdownsyntax. This document explains the syntax, noting differences from original Markdown. Except where noted, these differences can be suppressed by using the markdown_strict format instead of markdown. Extensions can be enabled or disabled to specify the behavior more granularly. They are described in the following. See also Extensions above, for extensions that work also on other formats.

Philosophy

Markdown is designed to be easy to write, and, even more importantly, easy to read:

A Markdown-formatted document should be publishable as-is, as plain text, without looking like it’s been marked up with tags or formatting instructions. – John Gruber

This principle has guided pandoc’s decisions in finding syntax for tables, footnotes, and other extensions.

There is, however, one respect in which pandoc’s aims are different from the original aims of Markdown. Whereas Markdown was originally designed with HTML generation in mind, pandoc is designed for multiple output formats. Thus, while pandoc allows the embedding of raw HTML, it discourages it, and provides other, non-HTMLish ways of representing important document elements like definition lists, tables, mathematics, and footnotes.

Paragraphs

A paragraph is one or more lines of text followed by one or more blank lines. Newlines are treated as spaces, so you can reflow your paragraphs as you like. If you need a hard line break, put two or more spaces at the end of a line.

Extension: escaped_line_breaks

A backslash followed by a newline is also a hard line break. Note: in multiline and grid table cells, this is the only way to create a hard line break, since trailing spaces in the cells are ignored.

Headings

There are two kinds of headings: Setext and ATX.

Setext-style headings

A setext-style heading is a line of text “underlined” with a row of = signs (for a level-one heading) or -signs (for a level-two heading):

    A level-one heading
===================

A level-two heading
-------------------

The heading text can contain inline formatting, such as emphasis (see Inline formatting, below).

ATX-style headings

An ATX-style heading consists of one to six # signs and a line of text, optionally followed by any number of # signs. The number of # signs at the beginning of the line is the heading level:

    ## A level-two heading

### A level-three heading ###

As with setext-style headings, the heading text can contain formatting:

    # A level-one heading with a [link](/url) and *emphasis*

Heading identifiers

See also the auto_identifiers extensionabove.

Block quotations

Markdown uses email conventions for quoting blocks of text. A block quotation is one or more paragraphs or other block elements (such as lists or headings), with each line preceded by a > character and an optional space. (The > need not start at the left margin, but it should not be indented more than three spaces.)

    > This is a block quote. This
> paragraph has two lines.
>
> 1. This is a list inside a block quote.
> 2. Second item.

A “lazy” form, which requires the > character only on the first line of each block, is also allowed:

    > This is a block quote. This
paragraph has two lines.

> 1. This is a list inside a block quote.
2. Second item.

Among the block elements that can be contained in a block quote are other block quotes. That is, block quotes can be nested:

    > This is a block quote.
>
> > A block quote within a block quote.

If the > character is followed by an optional space, that space will be considered part of the block quote marker and not part of the indentation of the contents. Thus, to put an indented code block in a block quote, you need five spaces after the >:

    >     code

Extension: blank_before_blockquote

Original Markdown syntax does not require a blank line before a block quote. Pandoc does require this (except, of course, at the beginning of the document). The reason for the requirement is that it is all too easy for a > to end up at the beginning of a line by accident (perhaps through line wrapping). So, unless the markdown_strictformat is used, the following does not produce a nested block quote in pandoc:

    > This is a block quote.
>> Not nested, since `blank_before_blockquote` is enabled by default

Verbatim (code) blocks

Indented code blocks

A block of text indented four spaces (or one tab) is treated as verbatim text: that is, special characters do not trigger special formatting, and all spaces and line breaks are preserved. For example,

        if (a > 3) {
      moveShip(5 * gravity, DOWN);
    }

The initial (four space or one tab) indentation is not considered part of the verbatim text, and is removed in the output.

Note: blank lines in the verbatim text need not begin with four spaces.

Fenced code blocks

Extension: fenced_code_blocks

In addition to standard indented code blocks, pandoc supports fenced code blocks. These begin with a row of three or more tildes (~) and end with a row of tildes that must be at least as long as the starting row. Everything between these lines is treated as code. No indentation is necessary:

    ~~~~~~~
if (a > 3) {
  moveShip(5 * gravity, DOWN);
}
~~~~~~~

Like regular code blocks, fenced code blocks must be separated from surrounding text by blank lines.

If the code itself contains a row of tildes or backticks, just use a longer row of tildes or backticks at the start and end:

    ~~~~~~~~~~~~~~~~
~~~~~~~~~~
code including tildes
~~~~~~~~~~
~~~~~~~~~~~~~~~~

Extension: backtick_code_blocks

Same as fenced_code_blocks, but uses backticks (```) instead of tildes (~).

Extension: fenced_code_attributes

Optionally, you may attach attributes to fenced or backtick code block using this syntax:

    ~~~~ {#mycode .haskell .numberLines startFrom="100"}
qsort []     = []
qsort (x:xs) = qsort (filter (< x) xs) ++ [x] ++
               qsort (filter (>= x) xs)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here mycode is an identifier, haskell and numberLines are classes, and startFrom is an attribute with value 100. Some output formats can use this information to do syntax highlighting. Currently, the only output formats that use this information are HTML, LaTeX, Docx, Ms, and PowerPoint. If highlighting is supported for your output format and language, then the code block above will appear highlighted, with numbered lines. (To see which languages are supported, type pandoc --list-highlight-languages.) Otherwise, the code block above will appear as follows:

    <pre id="mycode" class="haskell numberLines" startFrom="100">
  <code>
  ...
  </code>
</pre>

The numberLines (or number-lines) class will cause the lines of the code block to be numbered, starting with 1 or the value of the startFrom attribute. The lineAnchors (or line-anchors) class will cause the lines to be clickable anchors in HTML output.

A shortcut form can also be used for specifying the language of the code block:

    ```haskell
qsort [] = []


This is equivalent to:


``` {.haskell}

qsort [] = []

This shortcut form may be combined with attributes:

    ```haskell {.numberLines}
qsort [] = []


Which is equivalent to:


``` {.haskell .numberLines}

qsort [] = []

If the fenced_code_attributesextension is disabled, but input contains class attribute(s) for the code block, the first class attribute will be printed after the opening fence as a bare word.

To prevent all highlighting, use the --no-highlight flag. To set the highlighting style, use --highlight-style. For more information on highlighting, see Syntax highlighting, below.

Line blocks

Extension: line_blocks

A line block is a sequence of lines beginning with a vertical bar (|) followed by a space. The division into lines will be preserved in the output, as will any leading spaces; otherwise, the lines will be formatted as Markdown. This is useful for verse and addresses:

    | The limerick packs laughs anatomical
| In space that is quite economical.
|    But the good ones I've seen
|    So seldom are clean
| And the clean ones so seldom are comical

| 200 Main St.
| Berkeley, CA 94718

The lines can be hard-wrapped if needed, but the continuation line must begin with a space.

    | The Right Honorable Most Venerable and Righteous Samuel L.
  Constable, Jr.
| 200 Main St.
| Berkeley, CA 94718

Inline formatting (such as emphasis) is allowed in the content (though it can’t cross line boundaries). Block-level formatting (such as block quotes or lists) is not recognized.

This syntax is borrowed from reStructuredText.

Lists

Bullet lists

A bullet list is a list of bulleted list items. A bulleted list item begins with a bullet (*, +, or -). Here is a simple example:

    * one
* two
* three

This will produce a “compact” list. If you want a “loose” list, in which each item is formatted as a paragraph, put spaces between the items:

    * one

* two

* three

The bullets need not be flush with the left margin; they may be indented one, two, or three spaces. The bullet must be followed by whitespace.

List items look best if subsequent lines are flush with the first line (after the bullet):

    * here is my first
  list item.
* and my second.

But Markdown also allows a “lazy” format:

    * here is my first
list item.
* and my second.

Block content in list items

A list item may contain multiple paragraphs and other block-level content. However, subsequent paragraphs must be preceded by a blank line and indented to line up with the first non-space content after the list marker.

      * First paragraph.

    Continued.

  * Second paragraph. With a code block, which must be indented
    eight spaces:

        { code }

Exception: if the list marker is followed by an indented code block, which must begin 5 spaces after the list marker, then subsequent paragraphs must begin two columns after the last character of the list marker:

    *     code

  continuation paragraph

List items may include other lists. In this case the preceding blank line is optional. The nested list must be indented to line up with the first non-space character after the list marker of the containing list item.

    * fruits
  + apples
    - macintosh
    - red delicious
  + pears
  + peaches
* vegetables
  + broccoli
  + chard

As noted above, Markdown allows you to write list items “lazily,” instead of indenting continuation lines. However, if there are multiple paragraphs or other blocks in a list item, the first line of each must be indented.

    + A lazy, lazy, list
item.

+ Another one; this looks
bad but is legal.

    Second paragraph of second
list item.

Ordered lists

Ordered lists work just like bulleted lists, except that the items begin with enumerators rather than bullets.

In original Markdown, enumerators are decimal numbers followed by a period and a space. The numbers themselves are ignored, so there is no difference between this list:

    1.  one
2.  two
3.  three

and this one:

    5.  one
7.  two
1.  three

Extension: fancy_lists

Unlike original Markdown, pandoc allows ordered list items to be marked with uppercase and lowercase letters and roman numerals, in addition to Arabic numerals. List markers may be enclosed in parentheses or followed by a single right-parenthesis or period. They must be separated from the text that follows by at least one space, and, if the list marker is a capital letter with a period, by at least two spaces.1

The fancy_listsextension also allows ‘#’ to be used as an ordered list marker in place of a numeral:

    #. one
#. two

Note: the ‘#’ ordered list marker doesn’t work with commonmark.

Extension: startnum

Pandoc also pays attention to the type of list marker used, and to the starting number, and both of these are preserved where possible in the output format. Thus, the following yields a list with numbers followed by a single parenthesis, starting with 9, and a sublist with lowercase roman numerals:

     9)  Ninth
10)  Tenth
11)  Eleventh
       i. subone
      ii. subtwo
     iii. subthree

Pandoc will start a new list each time a different type of list marker is used. So, the following will create three lists:

    (2) Two
(5) Three
1.  Four
*   Five

If default list markers are desired, use #.:

    #.  one
#.  two
#.  three

Extension: task_lists

Pandoc supports task lists, using the syntax of GitHub-Flavored Markdown.

    - [ ] an unchecked task list item
- [x] checked item

Definition lists

Extension: definition_lists

Pandoc supports definition lists, using the syntax of PHP Markdown Extra with some extensions.2

    Term 1

:   Definition 1

Term 2 with *inline markup*

:   Definition 2

        { some code, part of Definition 2 }

    Third paragraph of definition 2.

Each term must fit on one line, which may optionally be followed by a blank line, and must be followed by one or more definitions. A definition begins with a colon or tilde, which may be indented one or two spaces.

A term may have multiple definitions, and each definition may consist of one or more block elements (paragraph, code block, list, etc.), each indented four spaces or one tab stop. The body of the definition (not including the first line) should be indented four spaces. However, as with other Markdown lists, you can “lazily” omit indentation except at the beginning of a paragraph or other block element:

    Term 1

:   Definition
with lazy continuation.

    Second paragraph of the definition.

If you leave space before the definition (as in the example above), the text of the definition will be treated as a paragraph. In some output formats, this will mean greater spacing between term/definition pairs. For a more compact definition list, omit the space before the definition:

    Term 1
  ~ Definition 1

Term 2
  ~ Definition 2a
  ~ Definition 2b

Note that space between items in a definition list is required. (A variant that loosens this requirement, but disallows “lazy” hard wrapping, can be activated with the compact_definition_listsextension.)

Numbered example lists

Extension: example_lists

The special list marker @ can be used for sequentially numbered examples. The first list item with a @ marker will be numbered ‘1’, the next ‘2’, and so on, throughout the document. The numbered examples need not occur in a single list; each new list using @ will take up where the last stopped. So, for example:

    (@)  My first example will be numbered (1).
(@)  My second example will be numbered (2).

Explanation of examples.

(@)  My third example will be numbered (3).

Numbered examples can be labeled and referred to elsewhere in the document:

    (@good)  This is a good example.

As (@good) illustrates, ...

The label can be any string of alphanumeric characters, underscores, or hyphens.

Continuation paragraphs in example lists must always be indented four spaces, regardless of the length of the list marker. That is, example lists always behave as if the four_space_rule extension is set. This is because example labels tend to be long, and indenting content to the first non-space character after the label would be awkward.

You can repeat an earlier numbered example by re-using its label:

    (@foo) Sample sentence.

Intervening text...

This theory can explain the case we saw earlier (repeated):

(@foo) Sample sentence.

This only works reliably, though, if the repeated item is in a list by itself, because each numbered example list will be numbered continuously from its starting number.

Ending a list

What if you want to put an indented code block after a list?

    -   item one
-   item two

    { my code block }

Trouble! Here pandoc (like other Markdown implementations) will treat { my code block }as the second paragraph of item two, and not as a code block.

To “cut off” the list after item two, you can insert some non-indented content, like an HTML comment, which won’t produce visible output in any format:

    -   item one
-   item two

<!-- end of list -->

    { my code block }

You can use the same trick if you want two consecutive lists instead of one big list:

    1.  one
2.  two
3.  three

<!-- -->

1.  uno
2.  dos
3.  tres

Horizontal rules

A line containing a row of three or more *, -, or _ characters (optionally separated by spaces) produces a horizontal rule:

    *  *  *  *

---------------

We strongly recommend that horizontal rules be separated from surrounding text by blank lines. If a horizontal rule is not followed by a blank line, pandoc may try to interpret the lines that follow as a YAML metadata block or a table.

Tables

Four kinds of tables may be used. The first three kinds presuppose the use of a fixed-width font, such as Courier. The fourth kind can be used with proportionally spaced fonts, as it does not require lining up columns.

Extension: table_captions

A caption may optionally be provided with all 4 kinds of tables (as illustrated in the examples below). A caption is a paragraph beginning with the string Table: (or table: or just :), which will be stripped off. It may appear either before or after the table.

Extension: simple_tables

Simple tables look like this:

      Right     Left     Center     Default
-------     ------ ----------   -------
     12     12        12            12
    123     123       123          123
      1     1          1             1

Table:  Demonstration of simple table syntax.

The header and table rows must each fit on one line. Column alignments are determined by the position of the header text relative to the dashed line below it:3

The table must end with a blank line, or a line of dashes followed by a blank line.

The column header row may be omitted, provided a dashed line is used to end the table. For example:

    -------     ------ ----------   -------
     12     12        12             12
    123     123       123           123
      1     1          1              1
-------     ------ ----------   -------

When the header row is omitted, column alignments are determined on the basis of the first line of the table body. So, in the tables above, the columns would be right, left, center, and right aligned, respectively.

Extension: multiline_tables

Multiline tables allow header and table rows to span multiple lines of text (but cells that span multiple columns or rows of the table are not supported). Here is an example:

    -------------------------------------------------------------
 Centered   Default           Right Left
  Header    Aligned         Aligned Aligned
----------- ------- --------------- -------------------------
   First    row                12.0 Example of a row that
                                    spans multiple lines.

  Second    row                 5.0 Here's another one. Note
                                    the blank line between
                                    rows.
-------------------------------------------------------------

Table: Here's the caption. It, too, may span
multiple lines.

These work like simple tables, but with the following differences:

In multiline tables, the table parser pays attention to the widths of the columns, and the writers try to reproduce these relative widths in the output. So, if you find that one of the columns is too narrow in the output, try widening it in the Markdown source.

The header may be omitted in multiline tables as well as simple tables:

    ----------- ------- --------------- -------------------------
   First    row                12.0 Example of a row that
                                    spans multiple lines.

  Second    row                 5.0 Here's another one. Note
                                    the blank line between
                                    rows.
----------- ------- --------------- -------------------------

: Here's a multiline table without a header.

It is possible for a multiline table to have just one row, but the row should be followed by a blank line (and then the row of dashes that ends the table), or the table may be interpreted as a simple table.

Extension: grid_tables

Grid tables look like this:

    : Sample grid table.

+---------------+---------------+--------------------+
| Fruit         | Price         | Advantages         |
+===============+===============+====================+
| Bananas       | $1.34         | - built-in wrapper |
|               |               | - bright color     |
+---------------+---------------+--------------------+
| Oranges       | $2.10         | - cures scurvy     |
|               |               | - tasty            |
+---------------+---------------+--------------------+

The row of =s separates the header from the table body, and can be omitted for a headerless table. The cells of grid tables may contain arbitrary block elements (multiple paragraphs, code blocks, lists, etc.).

Cells can span multiple columns or rows:

    +---------------------+----------+
| Property            | Earth    |
+=============+=======+==========+
|             | min   | -89.2 °C |
| Temperature +-------+----------+
| 1961-1990   | mean  | 14 °C    |
|             +-------+----------+
|             | max   | 56.7 °C  |
+-------------+-------+----------+

A table header may contain more than one row:

    +---------------------+-----------------------+
| Location            | Temperature 1961-1990 |
|                     | in degree Celsius     |
|                     +-------+-------+-------+
|                     | min   | mean  | max   |
+=====================+=======+=======+=======+
| Antarctica          | -89.2 | N/A   | 19.8  |
+---------------------+-------+-------+-------+
| Earth               | -89.2 | 14    | 56.7  |
+---------------------+-------+-------+-------+

Alignments can be specified as with pipe tables, by putting colons at the boundaries of the separator line after the header:

    +---------------+---------------+--------------------+
| Right         | Left          | Centered           |
+==============:+:==============+:==================:+
| Bananas       | $1.34         | built-in wrapper   |
+---------------+---------------+--------------------+

For headerless tables, the colons go on the top line instead:

    +--------------:+:--------------+:------------------:+
| Right         | Left          | Centered           |
+---------------+---------------+--------------------+

A table foot can be defined by enclosing it with separator lines that use = instead of -:

     +---------------+---------------+
 | Fruit         | Price         |
 +===============+===============+
 | Bananas       | $1.34         |
 +---------------+---------------+
 | Oranges       | $2.10         |
 +===============+===============+
 | Sum           | $3.44         |
 +===============+===============+

The foot must always be placed at the very bottom of the table.

Grid tables can be created easily using Emacs’ table-mode (M-x table-insert).

Extension: pipe_tables

Pipe tables look like this:

    | Right | Left | Default | Center |
|------:|:-----|---------|:------:|
|   12  |  12  |    12   |    12  |
|  123  |  123 |   123   |   123  |
|    1  |    1 |     1   |     1  |

  : Demonstration of pipe table syntax.

The syntax is identical to PHP Markdown Extra tables. The beginning and ending pipe characters are optional, but pipes are required between all columns. The colons indicate column alignment as shown. The header cannot be omitted. To simulate a headerless table, include a header with blank cells.

Since the pipes indicate column boundaries, columns need not be vertically aligned, as they are in the above example. So, this is a perfectly legal (though ugly) pipe table:

    fruit| price
-----|-----:
apple|2.05
pear|1.37
orange|3.09

The cells of pipe tables cannot contain block elements like paragraphs and lists, and cannot span multiple lines. If any line of the Markdown source is longer than the column width (see --columns), then the table will take up the full text width and the cell contents will wrap, with the relative cell widths determined by the number of dashes in the line separating the table header from the table body. (For example ---|- would make the first column 3/4 and the second column 1/4 of the full text width.) On the other hand, if no lines are wider than column width, then cell contents will not be wrapped, and the cells will be sized to their contents.

Note: pandoc also recognizes pipe tables of the following form, as can be produced by Emacs’ orgtbl-mode:

    | One | Two   |
|-----+-------|
| my  | table |
| is  | nice  |

The difference is that + is used instead of |. Other orgtbl features are not supported. In particular, to get non-default column alignment, you’ll need to add colons as above.

Metadata blocks

Extension: pandoc_title_block

If the file begins with a title block

    % title
% author(s) (separated by semicolons)
% date

it will be parsed as bibliographic information, not regular text. (It will be used, for example, in the title of standalone LaTeX or HTML output.) The block may contain just a title, a title and an author, or all three elements. If you want to include an author but no title, or a title and a date but no author, you need a blank line:

    %
% Author

    % My title
%
% June 15, 2006

The title may occupy multiple lines, but continuation lines must begin with leading space, thus:

    % My title
  on multiple lines

If a document has multiple authors, the authors may be put on separate lines with leading space, or separated by semicolons, or both. So, all of the following are equivalent:

    % Author One
  Author Two

    % Author One; Author Two

    % Author One;
  Author Two

The date must fit on one line.

All three metadata fields may contain standard inline formatting (italics, links, footnotes, etc.).

Title blocks will always be parsed, but they will affect the output only when the --standalone (-s) option is chosen. In HTML output, titles will appear twice: once in the document head—this is the title that will appear at the top of the window in a browser—and once at the beginning of the document body. The title in the document head can have an optional prefix attached (--title-prefix or -T option). The title in the body appears as an H1 element with class “title”, so it can be suppressed or reformatted with CSS. If a title prefix is specified with -T and no title block appears in the document, the title prefix will be used by itself as the HTML title.

The man page writer extracts a title, man page section number, and other header and footer information from the title line. The title is assumed to be the first word on the title line, which may optionally end with a (single-digit) section number in parentheses. (There should be no space between the title and the parentheses.) Anything after this is assumed to be additional footer and header text. A single pipe character (|) should be used to separate the footer text from the header text. Thus,

    % PANDOC(1)

will yield a man page with the title PANDOC and section 1.

    % PANDOC(1) Pandoc User Manuals

will also have “Pandoc User Manuals” in the footer.

    % PANDOC(1) Pandoc User Manuals | Version 4.0

will also have “Version 4.0” in the header.

Extension: yaml_metadata_block

A YAML metadata block is a valid YAML object, delimited by a line of three hyphens (---) at the top and a line of three hyphens (---) or three dots (...) at the bottom. The initial line --- must not be followed by a blank line. A YAML metadata block may occur anywhere in the document, but if it is not at the beginning, it must be preceded by a blank line.

Note that, because of the way pandoc concatenates input files when several are provided, you may also keep the metadata in a separate YAML file and pass it to pandoc as an argument, along with your Markdown files:

    pandoc chap1.md chap2.md chap3.md metadata.yaml -s -o book.html

Just be sure that the YAML file begins with --- and ends with --- or .... Alternatively, you can use the --metadata-file option. Using that approach however, you cannot reference content (like footnotes) from the main Markdown input document.

Metadata will be taken from the fields of the YAML object and added to any existing document metadata. Metadata can contain lists and objects (nested arbitrarily), but all string scalars will be interpreted as Markdown. Fields with names ending in an underscore will be ignored by pandoc. (They may be given a role by external processors.) Field names must not be interpretable as YAML numbers or boolean values (so, for example, yes, True, and 15 cannot be used as field names).

A document may contain multiple metadata blocks. If two metadata blocks attempt to set the same field, the value from the second block will be taken.

Each metadata block is handled internally as an independent YAML document. This means, for example, that any YAML anchors defined in a block cannot be referenced in another block.

When pandoc is used with -t markdown to create a Markdown document, a YAML metadata block will be produced only if the -s/--standalone option is used. All of the metadata will appear in a single block at the beginning of the document.

Note that YAML escaping rules must be followed. Thus, for example, if a title contains a colon, it must be quoted, and if it contains a backslash escape, then it must be ensured that it is not treated as a YAML escape sequence. The pipe character (|) can be used to begin an indented block that will be interpreted literally, without need for escaping. This form is necessary when the field contains blank lines or block-level formatting:

    ---
title:  'This is the title: it contains a colon'
author:
- Author One
- Author Two
keywords: [nothing, nothingness]
abstract: |
  This is the abstract.

  It consists of two paragraphs.
...

The literal block after the | must be indented relative to the line containing the |. If it is not, the YAML will be invalid and pandoc will not interpret it as metadata. For an overview of the complex rules governing YAML, see the Wikipedia entry on YAML syntax.

Template variables will be set automatically from the metadata. Thus, for example, in writing HTML, the variable abstract will be set to the HTML equivalent of the Markdown in the abstract field:

    <p>This is the abstract.</p>
<p>It consists of two paragraphs.</p>

Variables can contain arbitrary YAML structures, but the template must match this structure. The author variable in the default templates expects a simple list or string, but can be changed to support more complicated structures. The following combination, for example, would add an affiliation to the author if one is given:

    ---
title: The document title
author:
- name: Author One
  affiliation: University of Somewhere
- name: Author Two
  affiliation: University of Nowhere
...

To use the structured authors in the example above, you would need a custom template:

    $for(author)$
$if(author.name)$
$author.name$$if(author.affiliation)$ ($author.affiliation$)$endif$
$else$
$author$
$endif$
$endfor$

Raw content to include in the document’s header may be specified using header-includes; however, it is important to mark up this content as raw code for a particular output format, using the raw_attribute extension, or it will be interpreted as Markdown. For example:

    header-includes:
- |

  \let\oldsection\section
  \renewcommand{\section}[1]{\clearpage\oldsection{#1}}



Note: the `yaml_metadata_block` extension works with `commonmark` as well as `markdown` (and it is enabled by default in `gfm` and `commonmark_x`). However, in these formats the following restrictions apply:

 * The YAML metadata block must occur at the beginning of the document (and there can be only one). If multiple files are given as arguments to pandoc, only the first can be a YAML metadata block.
   
   
 * The leaf nodes of the YAML structure are parsed in isolation from each other and from the rest of the document. So, for example, you can’t use a reference link in these contexts if the link definition is somewhere else in the document.
   
   

## Backslash escapes

### Extension: `all_symbols_escapable` 

Except inside a code block or inline code, any punctuation or space character preceded by a backslash will be treated literally, even if it would normally indicate formatting. Thus, for example, if one writes


*\*hello\**


one will get


<em>*hello*</em>


instead of


<strong>hello</strong>


This rule is easier to remember than original Markdown’s rule, which allows only the following characters to be backslash-escaped:


\`*_{}[]()>#+-.!


(However, if the `markdown_strict` format is used, the original Markdown rule will be used.)

A backslash-escaped space is parsed as a nonbreaking space. In TeX output, it will appear as `~`. In HTML and XML output, it will appear as a literal unicode nonbreaking space character (note that it will thus actually look “invisible” in the generated HTML source; you can still use the [`--ascii`](https://pandoc.org/MANUAL.html#option--ascii[) command-line option to make it appear as an explicit entity).

A backslash-escaped newline (i.e. a backslash occurring at the end of a line) is parsed as a hard line break. It will appear in TeX output as `\\` and in HTML as `<br />`. This is a nice alternative to Markdown’s “invisible” way of indicating hard line breaks using two trailing spaces on a line.

Backslash escapes do not work in verbatim contexts.

## Inline formatting

### Emphasis

To _emphasize_ some text, surround it with `*`s or `_`, like this:


This text is _emphasized with underscores_, and this

is emphasized with asterisks.


Double `*` or `_` produces **strong emphasis**:


This is **strong emphasis** and __with underscores__.


A `*` or `_` character surrounded by spaces, or backslash-escaped, will not trigger emphasis:


This is * not emphasized *, and \*neither is this\*.


### Extension: `intraword_underscores` 

Because `_` is sometimes used inside words and identifiers, pandoc does not interpret a `_` surrounded by alphanumeric characters as an emphasis marker. If you want to emphasize just part of a word, use `*`:


feas*ible*, not feas*able*.


### Strikeout

### Extension: `strikeout` 

To strike out a section of text with a horizontal line, begin and end it with `~~`. Thus, for example,


This ~~is deleted text.~~


### Superscripts and subscripts

### Extension: `superscript`, `subscript` 

Superscripts may be written by surrounding the superscripted text by `^` characters; subscripts may be written by surrounding the subscripted text by `~` characters. Thus, for example,


H~2~O is a liquid.  2^10^ is 1024.


The text between `^...^`or `~...~` may not contain spaces or newlines. If the superscripted or subscripted text contains spaces, these spaces must be escaped with backslashes. (This is to prevent accidental superscripting and subscripting through the ordinary use of `~` and `^`, and also bad interactions with footnotes.) Thus, if you want the letter P with ‘a cat’ in subscripts, use `P~a\ cat~`, not `P~a cat~`.

### Verbatim

To make a short span of text verbatim, put it inside backticks:


What is the difference between `>>=` and `>>`?


If the verbatim text includes a backtick, use double backticks:


Here is a literal backtick `` ` ``.


(The spaces after the opening backticks and before the closing backticks will be ignored.)

The general rule is that a verbatim span starts with a string of consecutive backticks (optionally followed by a space) and ends with a string of the same number of backticks (optionally preceded by a space).

Note that backslash-escapes (and other Markdown constructs) do not work in verbatim contexts:


This is a backslash followed by an asterisk: `\*`.


### Extension: `inline_code_attributes` 

Attributes can be attached to verbatim text, just as with [fenced code blocks](https://pandoc.org/MANUAL.html#fenced-code-blocks):


`<$>`{.haskell}


### Underline

To underline text, use the `underline` class:


[Underline]{.underline}


Or, without the `bracketed_spans` extension (but with `native_spans`):


<span class="underline">Underline</span>


This will work in all output formats that support underline.

### Small caps

To write small caps, use the `smallcaps` class:


[Small caps]{.smallcaps}


Or, without the `bracketed_spans` extension:


<span class="smallcaps">Small caps</span>


For compatibility with other Markdown flavors, CSS is also supported:


<span style="font-variant:small-caps;">Small caps</span>


This will work in all output formats that support small caps.

### Highlighting

To highlight text, use the `mark` class:


[Mark]{.mark}


Or, without the `bracketed_spans` extension (but with `native_spans`):


<span class="mark">Mark</span>


This will work in all output formats that support highlighting.

## Math

### Extension: `tex_math_dollars` 

Anything between two `$`characters will be treated as TeX math. The opening `$` must have a non-space character immediately to its right, while the closing `$` must have a non-space character immediately to its left, and must not be followed immediately by a digit. Thus, `$20,000 and $30,000` won’t parse as math. If for some reason you need to enclose text in literal `$` characters, backslash-escape them and they won’t be treated as math delimiters.

For display math, use `$$` delimiters. (In this case, the delimiters may be separated from the formula by whitespace. However, there can be no blank lines between the opening and closing `$$`delimiters.)

TeX math will be printed in all output formats. How it is rendered depends on the output format:

LaTeX It will appear verbatim surrounded by `\(...\)` (for inline math) or `\[...\]` (for display math). Markdown, Emacs Org mode, ConTeXt, ZimWiki It will appear verbatim surrounded by `$...$` (for inline math) or `$$...$$` (for display math). XWiki It will appear verbatim surrounded by `formula../formula`. reStructuredText It will be rendered using an [interpreted text role `:math:`](https://docutils.sourceforge.io/docs/ref/rst/roles.html#math). AsciiDoc For AsciiDoc output math will appear verbatim surrounded by `latexmath:[...]`. For `asciidoc_legacy` the bracketed material will also include inline or display math delimiters. Texinfo It will be rendered inside a `@math` command. roff man, Jira markup It will be rendered verbatim without `$`’s. MediaWiki, DokuWiki It will be rendered inside `<math>` tags. Textile It will be rendered inside `<span class="math">` tags. RTF, OpenDocument It will be rendered, if possible, using Unicode characters, and will otherwise appear verbatim. ODT It will be rendered, if possible, using MathML. DocBook If the [`--mathml`](https://pandoc.org/MANUAL.html#option--mathml) flag is used, it will be rendered using MathML in an `inlineequation` or `informalequation` tag. Otherwise it will be rendered, if possible, using Unicode characters. Docx and PowerPoint It will be rendered using OMML math markup. FictionBook2 If the [`--webtex`](https://pandoc.org/MANUAL.html#option--webtex) option is used, formulas are rendered as images using CodeCogs or other compatible web service, downloaded and embedded in the e-book. Otherwise, they will appear verbatim. HTML, Slidy, DZSlides, S5, EPUB The way math is rendered in HTML will depend on the command-line options selected. Therefore see [Math rendering in HTML](https://pandoc.org/MANUAL.html#math-rendering-in-html) above. 

## Raw HTML

### Extension: `raw_html` 

Markdown allows you to insert raw HTML (or DocBook) anywhere in a document (except verbatim contexts, where `<`, `>`, and `&` are interpreted literally). (Technically this is not an extension, since standard Markdown allows it, but it has been made an extension so that it can be disabled if desired.)

The raw HTML is passed through unchanged in HTML, S5, Slidy, Slideous, DZSlides, EPUB, Markdown, CommonMark, Emacs Org mode, and Textile output, and suppressed in other formats.

For a more explicit way of including raw HTML in a Markdown document, see the [`raw_attribute`extension](https://pandoc.org/MANUAL.html#extension-raw_attribute).

In the CommonMark format, if `raw_html` is enabled, superscripts, subscripts, strikeouts and small capitals will be represented as HTML. Otherwise, plain-text fallbacks will be used. Note that even if `raw_html` is disabled, tables will be rendered with HTML syntax if they cannot use pipe syntax.

### Extension: `markdown_in_html_blocks` 

Original Markdown allows you to include HTML “blocks”: blocks of HTML between balanced tags that are separated from the surrounding text with blank lines, and start and end at the left margin. Within these blocks, everything is interpreted as HTML, not Markdown; so (for example), `*` does not signify emphasis.

Pandoc behaves this way when the `markdown_strict` format is used; but by default, pandoc interprets material between HTML block tags as Markdown. Thus, for example, pandoc will turn


<table>
*one* [a link](https://google.com) 

into


<table>
one a link 

whereas `Markdown.pl`will preserve it as is.

There is one exception to this rule: text between `<script>`, `<style>`, `<pre>`, and `<textarea>` tags is not interpreted as Markdown.

This departure from original Markdown should make it easier to mix Markdown with HTML block elements. For example, one can surround a block of Markdown text with `<div>` tags without preventing it from being interpreted as Markdown.

### Extension: `native_divs` 

Use native pandoc `Div`blocks for content inside `<div>` tags. For the most part this should give the same output as `markdown_in_html_blocks`, but it makes it easier to write pandoc filters to manipulate groups of blocks.

### Extension: `native_spans` 

Use native pandoc `Span`blocks for content inside `<span>` tags. For the most part this should give the same output as `raw_html`, but it makes it easier to write pandoc filters to manipulate groups of inlines.

### Extension: `raw_tex` 

In addition to raw HTML, pandoc allows raw LaTeX, TeX, and ConTeXt to be included in a document. Inline TeX commands will be preserved and passed unchanged to the LaTeX and ConTeXt writers. Thus, for example, you can use LaTeX to include BibTeX citations:


This result was proved in \cite{jones.1967}.


Note that in LaTeX environments, like


\begin{tabular}{|l|l|}\hline

Age & Frequency \ \hline 18--25 & 15 \ 26--35 & 33 \ 36--45 & 22 \ \hline \end{tabular}


the material between the begin and end tags will be interpreted as raw LaTeX, not as Markdown.

For a more explicit and flexible way of including raw TeX in a Markdown document, see the [`raw_attribute`extension](https://pandoc.org/MANUAL.html#extension-raw_attribute).

Inline LaTeX is ignored in output formats other than Markdown, LaTeX, Emacs Org mode, and ConTeXt.

### Generic raw attribute

### Extension: `raw_attribute` 

Inline spans and fenced code blocks with a special kind of attribute will be parsed as raw content with the designated format. For example, the following produces a raw roff `ms` block:


```{=ms}

.MYMACRO blah blah

And the following produces a raw html inline element:

    This is `<a>html</a>`{=html}

This can be useful to insert raw xml into docx documents, e.g. a pagebreak:

    ```{=openxml}
<w:p>
  <w:r>
    <w:br w:type="page"/>
  </w:r>
</w:p>


The format name should match the target format name (see [`-t/--to`](https://pandoc.org/MANUAL.html#option--to), above, for a list, or use `pandoc --list-output-formats`). Use `openxml` for `docx` output, `opendocument` for `odt` output, `html5` for `epub3` output, `html4` for `epub2` output, and `latex`, `beamer`, `ms`, or `html5` for `pdf` output (depending on what you use for [`--pdf-engine`](https://pandoc.org/MANUAL.html#option--pdf-engine)).

This extension presupposes that the relevant kind of inline code or fenced code block is enabled. Thus, for example, to use a raw attribute with a backtick code block, `backtick_code_blocks` must be enabled.

The raw attribute cannot be combined with regular attributes.

## LaTeX macros

### Extension: `latex_macros` 

When this extension is enabled, pandoc will parse LaTeX macro definitions and apply the resulting macros to all LaTeX math and raw LaTeX. So, for example, the following will work in all output formats, not just LaTeX:


\newcommand{\tuple}[1]{\langle #1 \rangle}

\(\tuple{a, b, c}\)


Note that LaTeX macros will not be applied if they occur inside a raw span or block marked with the [`raw_attribute`extension](https://pandoc.org/MANUAL.html#extension-raw_attribute).

When `latex_macros` is disabled, the raw LaTeX and math will not have macros applied. This is usually a better approach when you are targeting LaTeX or PDF.

Macro definitions in LaTeX will be passed through as raw LaTeX only if `latex_macros` is not enabled. Macro definitions in Markdown source (or other formats allowing `raw_tex`) will be passed through regardless of whether `latex_macros` is enabled.

## Links

Markdown allows links to be specified in several ways.

### Automatic links

If you enclose a URL or email address in pointy brackets, it will become a link:


<https://google.com>

sam@green.eggs.ham


### Inline links

An inline link consists of the link text in square brackets, followed by the URL in parentheses. (Optionally, the URL can be followed by a link title, in quotes.)


This is an [inline link](/url), and here's [one with

a title](https://fsf.org "click here for a good time!").


There can be no space between the bracketed part and the parenthesized part. The link text can contain formatting (such as emphasis), but the title cannot.

Email addresses in inline links are not autodetected, so they have to be prefixed with `mailto`:


[Write me!](mailto:sam@green.eggs.ham)


### Reference links

An _explicit_ reference link has two parts, the link itself and the link definition, which may occur elsewhere in the document (either before or after the link).

The link consists of link text in square brackets, followed by a label in square brackets. (There cannot be space between the two unless the `spaced_reference_links`extension is enabled.) The link definition consists of the bracketed label, followed by a colon and a space, followed by the URL, and optionally (after a space) a link title either in quotes or in parentheses. The label must not be parseable as a citation (assuming the `citations`extension is enabled): citations take precedence over link labels.

Here are some examples:


[my label 1]: /foo/bar.html  "My title, optional"


The URL may optionally be surrounded by angle brackets:


[my label 5]: <http://foo.bar.baz>


The title may go on the next line:


[my label 3]: https://fsf.org

"The Free Software Foundation"


Note that link labels are not case sensitive. So, this will work:


Here is [my link][FOO]


In an _implicit_ reference link, the second pair of brackets is empty:


See [my website][].


Note: In `Markdown.pl`and most other Markdown implementations, reference link definitions cannot occur in nested constructions such as list items or block quotes. Pandoc lifts this arbitrary-seeming restriction. So the following is fine in pandoc, though not in most other implementations:


> My block [quote].

[quote]: /foo


### Extension: `shortcut_reference_links` 

In a _shortcut_ reference link, the second pair of brackets may be omitted entirely:


See [my website].


### Internal links

To link to another section of the same document, use the automatically generated identifier (see [Heading identifiers](https://pandoc.org/MANUAL.html#heading-identifiers)). For example:


See the [Introduction](#introduction).


or


See the [Introduction].


Internal links are currently supported for HTML formats (including HTML slide shows and EPUB), LaTeX, and ConTeXt.

## Images

A link immediately preceded by a `!` will be treated as an image. The link text will be used as the image’s alt text:


![la lune](lalune.jpg "Voyage to the moon")
movie reel
movie reel

### Extension: `implicit_figures` 

An image with nonempty alt text, occurring by itself in a paragraph, will be rendered as a figure with a caption. The image’s alt text will be used as the caption.


![This is the caption](/url/of/image.png)


How this is rendered depends on the output format. Some output formats (e.g. RTF) do not yet support figures. In those formats, you’ll just get an image in a paragraph by itself, with no caption.

If you just want a regular inline image, just make sure it is not the only thing in the paragraph. One way to do this is to insert a nonbreaking space after the image:


![This image won't be a figure](/url/of/image.png)\


Note that in reveal.js slide shows, an image in a paragraph by itself that has the `r-stretch` class will fill the screen, and the caption and figure tags will be omitted.

### Extension: `link_attributes` 

Attributes can be set on links and images:


An inline ![image](foo.jpg){#id .class width=30 height=20px}

and a reference image with attributes.


(This syntax is compatible with [PHP Markdown Extra](https://michelf.ca/projects/php-markdown/extra/) when only `#id` and `.class` are used.)

For HTML and EPUB, all known HTML5 attributes except `width` and `height` (but including `srcset` and `sizes`) are passed through as is. Unknown attributes are passed through as custom attributes, with `data-` prepended. The other writers ignore attributes that are not specifically supported by their output format.

The `width` and `height` attributes on images are treated specially. When used without a unit, the unit is assumed to be pixels. However, any of the following unit identifiers can be used: `px`, `cm`, `mm`, `in`, `inch` and `%`. There must not be any spaces between the number and the unit. For example:


![](file.jpg){ width=50% }


 * Dimensions may be converted to a form that is compatible with the output format (for example, dimensions given in pixels will be converted to inches when converting HTML to LaTeX). Conversion between pixels and physical measurements is affected by the [`--dpi`](https://pandoc.org/MANUAL.html#option--dpi) option (by default, 96 dpi is assumed, unless the image itself contains dpi information).
 * The `%` unit is generally relative to some available space. For example the above example will render to the following. 
   
   
    * HTML: `<img href="file.jpg" style="width: 50%;" />`
    * LaTeX: `\includegraphics[width=0.5\textwidth,height=\textheight]{file.jpg}`(If you’re using a custom template, you need to configure `graphicx` as in the default template.)
    * ConTeXt: `\externalfigure[file.jpg][width=0.5\textwidth]`
   
   
 * Some output formats have a notion of a class ([ConTeXt](https://wiki.contextgarden.net/Using_Graphics#Multiple_Image_Settings)) or a unique identifier (LaTeX `\caption`), or both (HTML).
 * When no `width` or `height` attributes are specified, the fallback is to look at the image resolution and the dpi metadata embedded in the image file.

## Divs and Spans

Using the `native_divs`and `native_spans`extensions (see [above](https://pandoc.org/MANUAL.html#extension-native_divs)), HTML syntax can be used as part of Markdown to create native `Div` and `Span` elements in the pandoc AST (as opposed to raw HTML). However, there is also nicer syntax available:

### Extension: `fenced_divs` 

Allow special fenced syntax for native `Div` blocks. A Div starts with a fence containing at least three consecutive colons plus some attributes. The attributes may optionally be followed by another string of consecutive colons.

Note: the `commonmark`parser doesn’t permit colons after the attributes.

The attribute syntax is exactly as in fenced code blocks (see [Extension: `fenced_code_attributes`](https://pandoc.org/MANUAL.html#extension-fenced_code_attributes)). As with fenced code blocks, one can use either attributes in curly braces or a single unbraced word, which will be treated as a class name. The Div ends with another line containing a string of at least three consecutive colons. The fenced Div should be separated by blank lines from preceding and following blocks.

Example:


::::: {#special .sidebar}

Here is a paragraph.

And another.
::::

Fenced divs can be nested. Opening fences are distinguished because they _must_ have attributes:


::: Warning ::::::

This is a warning.

::: Danger This is a warning within a warning. ::: ::::::::::::::::::


Fences without attributes are always closing fences. Unlike with fenced code blocks, the number of colons in the closing fence need not match the number in the opening fence. However, it can be helpful for visual clarity to use fences of different lengths to distinguish nested divs from their parents.

### Extension: `bracketed_spans` 

A bracketed sequence of inlines, as one would use to begin a link, will be treated as a `Span` with attributes if it is followed immediately by attributes:


[This is *some text*]{.class key="val"}


## Footnotes

### Extension: `footnotes` 

Pandoc’s Markdown allows footnotes, using the following syntax:


Here is a footnote reference,[^1] and another.[^longnote]

This paragraph won't be part of the note, because it isn't indented.


The identifiers in footnote references may not contain spaces, tabs, newlines, or the characters `^`, `[`, or `]`. These identifiers are used only to correlate the footnote reference with the note itself; in the output, footnotes will be numbered sequentially.

The footnotes themselves need not be placed at the end of the document. They may appear anywhere except inside other block elements (lists, block quotes, tables, etc.). Each footnote should be separated from surrounding content (including other footnotes) by blank lines.

### Extension: `inline_notes` 

Inline footnotes are also allowed (though, unlike regular notes, they cannot contain multiple paragraphs). The syntax is as follows:


Here is an inline note.^[Inline notes are easier to write, since

you don't have to pick an identifier and move down to type the note.]


Inline and regular footnotes may be mixed freely.

## Citation syntax

### Extension: `citations` 

To cite a bibliographic item with an identifier foo, use the syntax `@foo`. Normal citations should be included in square brackets, with semicolons separating distinct items:


Blah blah [@doe99; @smith2000; @smith2004].


How this is rendered depends on the citation style. In an author-date style, it might render as


Blah blah (Doe 1999, Smith 2000, 2004).


In a footnote style, it might render as


Blah blah.[^1]


See the [CSL user documentation](https://citationstyles.org/authors/) for more information about CSL styles and how they affect rendering.

Unless a citation key starts with a letter, digit, or `_`, and contains only alphanumerics and single internal punctuation characters (`:.#$%&-+?<>~/`), it must be surrounded by curly braces, which are not considered part of the key. In `@Foo_bar.baz.`, the key is `Foo_bar.baz` because the final period is not _internal_ punctuation, so it is not included in the key. In `@{Foo_bar.baz.}`, the key is `Foo_bar.baz.`, including the final period. In `@Foo_bar--baz`, the key is `Foo_bar` because the repeated internal punctuation characters terminate the key. The curly braces are recommended if you use URLs as keys: `[@{https://example.com/bib?name=foobar&date=2000}, p. 33]`.

Citation items may optionally include a prefix, a locator, and a suffix. In


Blah blah [see @doe99, pp. 33-35 and *passim*; @smith04, chap. 1].


the first item (`doe99`) has prefix `see`, locator `pp. 33-35`, and suffix `and *passim*`. The second item (`smith04`) has locator `chap. 1` and no prefix or suffix.

Pandoc uses some heuristics to separate the locator from the rest of the subject. It is sensitive to the locator terms defined in the [CSL locale files](https://github.com/citation-style-language/locales). Either abbreviated or unabbreviated forms are accepted. In the `en-US`locale, locator terms can be written in either singular or plural forms, as `book`, `bk.`/`bks.`; `chapter`, `chap.`/`chaps.`; `column`, `col.`/`cols.`; `figure`, `fig.`/`figs.`; `folio`, `fol.`/`fols.`; `number`, `no.`/`nos.`; `line`, `l.`/`ll.`; `note`, `n.`/`nn.`; `opus`, `op.`/`opp.`; `page`, `p.`/`pp.`; `paragraph`, `para.`/`paras.`; `part`, `pt.`/`pts.`; `section`, `sec.`/`secs.`; `sub verbo`, `s.v.`/`s.vv.`; `verse`, `v.`/`vv.`; `volume`, `vol.`/`vols.`; `¶`/`¶¶`; `§`/`§§`. If no locator term is used, “page” is assumed.

In complex cases, you can force something to be treated as a locator by enclosing it in curly braces or prevent parsing the suffix as locator by prepending curly braces:


[@smith{ii, A, D-Z}, with a suffix]

[@smith, {pp. iv, vi-xi, (xv)-(xvii)} with suffix here] [@smith{}, 99 years later]


A minus sign (`-`) before the `@` will suppress mention of the author in the citation. This can be useful when the author is already mentioned in the text:


Smith says blah [-@smith04].


You can also write an author-in-text citation, by omitting the square brackets:


@smith04 says blah.

@smith04 [p. 33] says blah.


This will cause the author’s name to be rendered, followed by the bibliographical details. Use this form when you want to make the citation the subject of a sentence.

When you are using a note style, it is usually better to let citeproc create the footnotes from citations rather than writing an explicit note. If you do write an explicit note that contains a citation, note that normal citations will be put in parentheses, while author-in-text citations will not. For this reason, it is sometimes preferable to use the author-in-text style inside notes when using a note style.

## Non-default extensions

The following Markdown syntax extensions are not enabled by default in pandoc, but may be enabled by adding `+EXTENSION` to the format name, where `EXTENSION` is the name of the extension. Thus, for example, `markdown+hard_line_breaks` is Markdown with hard line breaks.

### Extension: `rebase_relative_paths` 

Rewrite relative paths for Markdown links and images, depending on the path of the file containing the link or image link. For each link or image, pandoc will compute the directory of the containing file, relative to the working directory, and prepend the resulting path to the link or image path.

The use of this extension is best understood by example. Suppose you have a subdirectory for each chapter of a book, `chap1`, `chap2`, `chap3`. Each contains a file `text.md` and a number of images used in the chapter. You would like to have `![image](spider.jpg)` in `chap1/text.md` refer to `chap1/spider.jpg` and `![image](spider.jpg)` in `chap2/text.md` refer to `chap2/spider.jpg`. To do this, use


pandoc chap*/*.md -f markdown+rebase_relative_paths


Without this extension, you would have to use `![image](chap1/spider.jpg)` in `chap1/text.md` and `![image](chap2/spider.jpg)` in `chap2/text.md`. Links with relative paths will be rewritten in the same way as images.

Absolute paths and URLs are not changed. Neither are empty paths or paths consisting entirely of a fragment, e.g., `#foo`.

Note that relative paths in reference links and images will be rewritten relative to the file containing the link reference definition, not the file containing the reference link or image itself, if these differ.

### Extension: `mark` 

To highlight out a section of text, begin and end it with with `==`. Thus, for example,


This ==is deleted text.==


### Extension: `attributes` 

Allows attributes to be attached to any inline or block-level element when parsing `commonmark`. The syntax for the attributes is the same as that used in [`header_attributes`](https://pandoc.org/MANUAL.html#extension-header_attributes).

 * Attributes that occur immediately after an inline element affect that element. If they follow a space, then they belong to the space. (Hence, this option subsumes `inline_code_attributes` and `link_attributes`.)
 * Attributes that occur immediately before a block element, on a line by themselves, affect that element.
 * Consecutive attribute specifiers may be used, either for blocks or for inlines. Their attributes will be combined.
 * Attributes that occur at the end of the text of a Setext or ATX heading (separated by whitespace from the text) affect the heading element. (Hence, this option subsumes `header_attributes`.)
 * Attributes that occur after the opening fence in a fenced code block affect the code block element. (Hence, this option subsumes `fenced_code_attributes`.)
 * Attributes that occur at the end of a reference link definition affect links that refer to that definition.

Note that pandoc’s AST does not currently allow attributes to be attached to arbitrary elements. Hence a Span or Div container will be added if needed.

### Extension: `old_dashes` 

Selects the pandoc <= 1.8.2.1 behavior for parsing smart dashes: `-` before a numeral is an en-dash, and `--` is an em-dash. This option only has an effect if `smart` is enabled. It is selected automatically for `textile` input.

### Extension: `angle_brackets_escapable` 

Allow `<` and `>` to be backslash-escaped, as they can be in GitHub flavored Markdown but not original Markdown. This is implied by pandoc’s default `all_symbols_escapable`.

### Extension: `lists_without_preceding_blankline` 

Allow a list to occur right after a paragraph, with no intervening blank space.

### Extension: `four_space_rule` 

Selects the pandoc <= 2.0 behavior for parsing lists, so that four spaces indent are needed for list item continuation paragraphs.

### Extension: `spaced_reference_links` 

Allow whitespace between the two components of a reference link, for example,


[foo] [bar].


### Extension: `hard_line_breaks` 

Causes all newlines within a paragraph to be interpreted as hard line breaks instead of spaces.

### Extension: `ignore_line_breaks` 

Causes newlines within a paragraph to be ignored, rather than being treated as spaces or as hard line breaks. This option is intended for use with East Asian languages where spaces are not used between words, but text is divided into lines for readability.

### Extension: `east_asian_line_breaks` 

Causes newlines within a paragraph to be ignored, rather than being treated as spaces or as hard line breaks, when they occur between two East Asian wide characters. This is a better choice than `ignore_line_breaks`for texts that include a mix of East Asian wide characters and other characters.

### Extension: `emoji` 

Parses textual emojis like `:smile:` as Unicode emoticons.

### Extension: `tex_math_gfm` 

Supports two GitHub-specific formats for math. Inline math: `$`e=mc^2`$`.

Display math:


``` math

e=mc2

Extension: tex_math_single_backslash

Causes anything between \( and \) to be interpreted as inline TeX math, and anything between \[ and \] to be interpreted as display TeX math. Note: a drawback of this extension is that it precludes escaping ( and [.

Extension: tex_math_double_backslash

Causes anything between \\( and \\) to be interpreted as inline TeX math, and anything between \\[ and \\] to be interpreted as display TeX math.

Extension: markdown_attribute

By default, pandoc interprets material inside block-level tags as Markdown. This extension changes the behavior so that Markdown is only parsed inside block-level tags if the tags have the attribute markdown=1.

Extension: mmd_title_block

Enables a MultiMarkdownstyle title block at the top of the document, for example:

    Title:   My title
Author:  John Doe
Date:    September 1, 2008
Comment: This is a sample mmd title block, with
         a field spanning multiple lines.

See the MultiMarkdown documentation for details. If pandoc_title_block or yaml_metadata_block is enabled, it will take precedence over mmd_title_block.

Extension: abbreviations

Parses PHP Markdown Extra abbreviation keys, like

    *[HTML]: Hypertext Markup Language

Note that the pandoc document model does not support abbreviations, so if this extension is enabled, abbreviation keys are simply skipped (as opposed to being parsed as paragraphs).

Extension: alerts

Supports GitHub-style Markdown alerts, like

    > [!TIP]
> Helpful advice for doing things better or more easily.

Extension: autolink_bare_uris

Makes all absolute URIs into links, even when not surrounded by pointy braces <...>.

Extension: mmd_link_attributes

Parses MultiMarkdown-style key-value attributes on link and image references. This extension should not be confused with the link_attributesextension.

    This is a reference ![image][ref] with MultiMarkdown attributes.

[ref]: https://path.to/image "Image title" width=20px height=30px
       id=myId class="myClass1 myClass2"

Extension: compact_definition_lists

Activates the definition list syntax of pandoc 1.12.x and earlier. This syntax differs from the one described above under Definition lists in several respects:

Extension: gutenberg

Use Project Gutenbergconventions for plainoutput: all-caps for strong emphasis, surround by underscores for regular emphasis, add extra blank space around headings.

Extension: sourcepos

Include source position attributes when parsing commonmark. For elements that accept attributes, a data-pos attribute is added; other elements are placed in a surrounding Div or Span element with a data-posattribute.

Extension: short_subsuperscripts

Parse MultiMarkdown-style subscripts and superscripts, which start with a ‘’ or ‘’ character, respectively, and include the alphanumeric sequence that follows. For example:

    x^2 = 4

or

    Oxygen is O~2.

Extension: wikilinks_title_after_pipe

Pandoc supports multiple Markdown wikilink syntaxes, regardless of whether the title is before or after the pipe.

Using --from=markdown+wikilinks_title_after_piperesults in

    [[URL|title]]

while using --from=markdown+wikilinks_title_before_piperesults in

    [[title|URL]]

Markdown variants

In addition to pandoc’s extended Markdown, the following Markdown variants are supported:

To see which extensions are supported for a given format, and which are enabled by default, you can use the command

    pandoc --list-extensions=FORMAT

where FORMAT is replaced with the name of the format.

Note that the list of extensions for commonmark, gfm, and commonmark_x are defined relative to default commonmark. So, for example, backtick_code_blocks does not appear as an extension, since it is enabled by default and cannot be disabled.

Citations

When the --citeproc option is used, pandoc can automatically generate citations and a bibliography in a number of styles. Basic usage is

    pandoc --citeproc myinput.txt

To use this feature, you will need to have

Specifying bibliographic data

You can specify an external bibliography using the bibliography metadata field in a YAML metadata section or the --bibliography command line argument. If you want to use multiple bibliography files, you can supply multiple --bibliography arguments or set bibliography metadata field to YAML array. A bibliography may have any of these formats:

Format File extension
BibLaTeX .bib
BibTeX .bibtex
CSL JSON .json
CSL YAML .yaml
RIS .ris

Note that .bib can be used with both BibTeX and BibLaTeX files; use the extension .bibtex to force interpretation as BibTeX.

In BibTeX and BibLaTeX databases, pandoc parses LaTeX markup inside fields such as title; in CSL YAML databases, pandoc Markdown; and in CSL JSON databases, an HTML-like markup:

<i>...</i> italics <b>...</b> bold <span style="font-variant:small-caps;">...</span>or <sc>...</sc> small capitals <sub>...</sub> subscript <sup>...</sup> superscript <span class="nocase">...</span> prevent a phrase from being capitalized as title case

As an alternative to specifying a bibliography file using --bibliography or the YAML metadata field bibliography, you can include the citation data directly in the references field of the document’s YAML metadata. The field should contain an array of YAML-encoded references, for example:

    ---
references:
- type: article-journal
  id: WatsonCrick1953
  author:
  - family: Watson
    given: J. D.
  - family: Crick
    given: F. H. C.
  issued:
    date-parts:
    - - 1953
      - 4
      - 25
  title: 'Molecular structure of nucleic acids: a structure for
    deoxyribose nucleic acid'
  title-short: Molecular structure of nucleic acids
  container-title: Nature
  volume: 171
  issue: 4356
  page: 737-738
  DOI: 10.1038/171737a0
  URL: https://www.nature.com/articles/171737a0
  language: en-GB
...

If both an external bibliography and inline (YAML metadata) references are provided, both will be used. In case of conflicting ids, the inline references will take precedence.

Note that pandoc can be used to produce such a YAML metadata section from a BibTeX, BibLaTeX, or CSL JSON bibliography:

    pandoc chem.bib -s -f biblatex -t markdown
pandoc chem.json -s -f csljson -t markdown

Indeed, pandoc can convert between any of these citation formats:

    pandoc chem.bib -s -f biblatex -t csljson
pandoc chem.yaml -s -f markdown -t biblatex

Running pandoc on a bibliography file with the --citeproc option will create a formatted bibliography in the format of your choice:

    pandoc chem.bib -s --citeproc -o chem.html
pandoc chem.bib -s --citeproc -o chem.pdf

Capitalization in titles

If you are using a bibtex or biblatex bibliography, then observe the following rules:

       title = {My Dinner with {Andre}}


       title = {Spin Wave Dispersion on the {nm} Scale}

Though this is not necessary in bibtex/biblatex, it is necessary with citeproc, which stores titles internally in sentence case, and converts to title case in styles that require it. Here we protect “nm” so that it doesn’t get converted to “Nm” at this stage.

If you are using a CSL bibliography (either JSON or YAML), then observe the following rules:

       Spin wave dispersion on the <span class="nocase">nm</span> scale

Conference Papers, Published vs. Unpublished

For a formally published conference paper, use the biblatex entry type inproceedings(which will be mapped to CSL paper-conference).

For an unpublished manuscript, use the biblatex entry type unpublished without an eventtitle field (this entry type will be mapped to CSL manuscript).

For a talk, an unpublished conference paper, or a poster presentation, use the biblatex entry type unpublished with an eventtitle field (this entry type will be mapped to CSL speech). Use the biblatex type field to indicate the type, e.g. “Paper”, or “Poster”. venue and eventdate may be useful too, though eventdate will not be rendered by most CSL styles. Note that venue is for the event’s venue, unlike location which describes the publisher’s location; do not use the latter for an unpublished conference paper.

Specifying a citation style

Citations and references can be formatted using any style supported by the Citation Style Language, listed in the Zotero Style Repository. These files are specified using the --csloption or the csl (or citation-style) metadata field. By default, pandoc will use the Chicago Manual of Style author-date format. (You can override this default by copying a CSL style of your choice to default.csl in your user data directory.) The CSL project provides further information on finding and editing styles.

The --citation-abbreviationsoption (or the citation-abbreviations metadata field) may be used to specify a JSON file containing abbreviations of journals that should be used in formatted bibliographies when form="short" is specified. The format of the file can be illustrated with an example:

    { "default": {
    "container-title": {
            "Lloyd's Law Reports": "Lloyd's Rep",
            "Estates Gazette": "EG",
            "Scots Law Times": "SLT"
    }
  }
}

Citations in note styles

Pandoc’s citation processing is designed to allow you to move between author-date, numerical, and note styles without modifying the Markdown source. When you’re using a note style, avoid inserting footnotes manually. Instead, insert citations just as you would in an author-date style—for example,

    Blah blah [@foo, p. 33].

The footnote will be created automatically. Pandoc will take care of removing the space and moving the note before or after the period, depending on the setting of notes-after-punctuation, as described below in Other relevant metadata fields.

In some cases you may need to put a citation inside a regular footnote. Normal citations in footnotes (such as [@foo, p. 33]) will be rendered in parentheses. In-text citations (such as @foo [p. 33]) will be rendered without parentheses. (A comma will be added if appropriate.) Thus:

    [^1]:  Some studies [@foo; @bar, p. 33] show that
frubulicious zoosnaps are quantical.  For a survey
of the literature, see @baz [chap. 1].

Placement of the bibliography

If the style calls for a list of works cited, it will be placed in a div with id refs, if one exists:

    ::: {#refs}
:::

Otherwise, it will be placed at the end of the document. Generation of the bibliography can be suppressed by setting suppress-bibliography: true in the YAML metadata.

If you wish the bibliography to have a section heading, you can set reference-section-title in the metadata, or put the heading at the beginning of the div with id refs (if you are using it) or at the end of your document:

    last paragraph...

# References

The bibliography will be inserted after this heading. Note that the unnumbered class will be added to this heading, so that the section will not be numbered.

If you want to put the bibliography into a variable in your template, one way to do that is to put the div with id refs into a metadata field, e.g.

    ---
refs: |
   ::: {#refs}
   :::
...

You can then put the variable $refs$ into your template where you want the bibliography to be placed.

Including uncited items in the bibliography

If you want to include items in the bibliography without actually citing them in the body text, you can define a dummy nocite metadata field and put the citations there:

    ---
nocite: |
  @item1, @item2
...

@item3

In this example, the document will contain a citation for item3 only, but the bibliography will contain entries for item1, item2, and item3.

It is possible to create a bibliography with all the citations, whether or not they appear in the document, by using a wildcard:

    ---
nocite: |
  @*
...

For LaTeX output, you can also use natbib or biblatex to render the bibliography. In order to do so, specify bibliography files as outlined above, and add --natbib or --biblatex argument to pandoc invocation. Bear in mind that bibliography files have to be in either BibTeX (for --natbib) or BibLaTeX (for --biblatex) format.

Other relevant metadata fields

A few other metadata fields affect bibliography formatting:

link-citations If true, citations will be hyperlinked to the corresponding bibliography entries (for author-date and numerical styles only). Defaults to false. link-bibliography If true, DOIs, PMCIDs, PMID, and URLs in bibliographies will be rendered as hyperlinks. (If an entry contains a DOI, PMCID, PMID, or URL, but none of these fields are rendered by the style, then the title, or in the absence of a title the whole entry, will be hyperlinked.) Defaults to true. lang

The lang field will affect how the style is localized, for example in the translation of labels, the use of quotation marks, and the way items are sorted. (For backwards compatibility, locale may be used instead of lang, but this use is deprecated.)

A BCP 47 language tag is expected: for example, en, de, en-US, fr-CA, ug-Cyrl. The unicode extension syntax (after -u-) may be used to specify options for collation (sorting) more precisely. Here are some examples:

notes-after-punctuation If true (the default for note styles), pandoc will put footnote references or superscripted numerical citations after following punctuation. For example, if the source contains blah blah [@jones99]., the result will look like blah blah.[^1], with the note moved after the period and the space collapsed. If false, the space will still be collapsed, but the footnote will not be moved after the punctuation. The option may also be used in numerical styles that use superscripts for citation numbers (but for these styles the default is not to move the citation).

Slide shows

You can use pandoc to produce an HTML + JavaScript slide presentation that can be viewed via a web browser. There are five ways to do this, using S5, DZSlides, Slidy, Slideous, or reveal.js. You can also produce a PDF slide show using LaTeX beamer, or slide shows in Microsoft PowerPointformat.

Here’s the Markdown source for a simple slide show, habits.txt:

    % Habits
% John Doe
% March 22, 2005

# In the morning

## Getting up

- Turn off alarm
- Get out of bed

## Breakfast

- Eat eggs
- Drink coffee

# In the evening

## Dinner

- Eat spaghetti
- Drink wine

------------------

![picture of spaghetti](images/spaghetti.jpg)

## Going to sleep

- Get in bed
- Count sheep

To produce an HTML/JavaScript slide show, simply type

    pandoc -t FORMAT -s habits.txt -o habits.html

where FORMAT is either s5, slidy, slideous, dzslides, or revealjs.

For Slidy, Slideous, reveal.js, and S5, the file produced by pandoc with the -s/--standalone option embeds a link to JavaScript and CSS files, which are assumed to be available at the relative path s5/default (for S5), slideous (for Slideous), reveal.js (for reveal.js), or at the Slidy website at w3.org (for Slidy). (These paths can be changed by setting the slidy-url, slideous-url, revealjs-url, or s5-url variables; see Variables for HTML slides, above.) For DZSlides, the (relatively short) JavaScript and CSS are included in the file by default.

With all HTML slide formats, the --self-contained option can be used to produce a single file that contains all of the data necessary to display the slide show, including linked scripts, stylesheets, images, and videos.

To produce a PDF slide show using beamer, type

    pandoc -t beamer habits.txt -o habits.pdf

Note that a reveal.js slide show can also be converted to a PDF by printing it to a file from the browser.

To produce a PowerPoint slide show, type

    pandoc habits.txt -o habits.pptx

Structuring the slide show

By default, the slide level is the highest heading level in the hierarchy that is followed immediately by content, and not another heading, somewhere in the document. In the example above, level-1 headings are always followed by level-2 headings, which are followed by content, so the slide level is 2. This default can be overridden using the --slide-level option.

The document is carved up into slides according to the following rules:

These rules are designed to support many different styles of slide show. If you don’t care about structuring your slides into sections and subsections, you can either just use level-1 headings for all slides (in that case, level 1 will be the slide level) or you can set --slide-level=0.

Note: in reveal.js slide shows, if slide level is 2, a two-dimensional layout will be produced, with level-1 headings building horizontally and level-2 headings building vertically. It is not recommended that you use deeper nesting of section levels with reveal.js unless you set --slide-level=0 (which lets reveal.js produce a one-dimensional layout and only interprets horizontal rules as slide boundaries).

PowerPoint layout choice

When creating slides, the pptx writer chooses from a number of pre-defined layouts, based on the content of the slide:

Title Slide This layout is used for the initial slide, which is generated and filled from the metadata fields date, author, and title, if they are present. Section Header This layout is used for what pandoc calls “title slides”, i.e. slides which start with a header which is above the slide level in the hierarchy. Two Content This layout is used for two-column slides, i.e. slides containing a div with class columnswhich contains at least two divs with class column. Comparison This layout is used instead of “Two Content” for any two-column slides in which at least one column contains text followed by non-text (e.g. an image or a table). Content with Caption This layout is used for any non-two-column slides which contain text followed by non-text (e.g. an image or a table). Blank This layout is used for any slides which only contain blank content, e.g. a slide containing only speaker notes, or a slide containing only a non-breaking space. Title and Content This layout is used for all slides which do not match the criteria for another layout.

These layouts are chosen from the default pptx reference doc included with pandoc, unless an alternative reference doc is specified using --reference-doc.

Incremental lists

By default, these writers produce lists that display “all at once.” If you want your lists to display incrementally (one item at a time), use the -ioption. If you want a particular list to depart from the default, put it in a div block with class incremental or nonincremental. So, for example, using the fenced div syntax, the following would be incremental regardless of the document default:

    ::: incremental

- Eat spaghetti
- Drink wine

:::

or

    ::: nonincremental

- Eat spaghetti
- Drink wine

:::

While using incremental and nonincremental divs is the recommended method of setting incremental lists on a per-case basis, an older method is also supported: putting lists inside a blockquote will depart from the document default (that is, it will display incrementally without the -ioption and all at once with the -ioption):

    > - Eat spaghetti
> - Drink wine

Both methods allow incremental and nonincremental lists to be mixed in a single document.

If you want to include a block-quoted list, you can work around this behavior by putting the list inside a fenced div, so that it is not the direct child of the block quote:

    > ::: wrapper
> - a
> - list in a quote
> :::

Inserting pauses

You can add “pauses” within a slide by including a paragraph containing three dots, separated by spaces:

    # Slide with a pause

content before the pause

. . .

content after the pause

Note: this feature is not yet implemented for PowerPoint output.

Styling the slides

You can change the style of HTML slides by putting customized CSS files in $DATADIR/s5/default (for S5), $DATADIR/slidy (for Slidy), or $DATADIR/slideous (for Slideous), where $DATADIRis the user data directory (see --data-dir, above). The originals may be found in pandoc’s system data directory (generally $CABALDIR/pandoc-VERSION/s5/default). Pandoc will look there for any files it does not find in the user data directory.

For dzslides, the CSS is included in the HTML file itself, and may be modified there.

All reveal.js configuration options can be set through variables. For example, themes can be used by setting the theme variable:

    -V theme=moon

Or you can specify a custom stylesheet using the --css option.

To style beamer slides, you can specify a theme, colortheme, fonttheme, innertheme, and outertheme, using the -V option:

    pandoc -t beamer habits.txt -V theme:Warsaw -o habits.pdf

Note that heading attributes will turn into slide attributes (on a <div> or <section>) in HTML slide formats, allowing you to style individual slides. In beamer, a number of heading classes and attributes are recognized as frame options and will be passed through as options to the frame: see Frame attributes in beamer, below.

Speaker notes

Speaker notes are supported in reveal.js, PowerPoint (pptx), and beamer output. You can add notes to your Markdown document thus:

    ::: notes

This is my note.

- It can contain Markdown
- like this list

:::

To show the notes window in reveal.js, press s while viewing the presentation. Speaker notes in PowerPoint will be available, as usual, in handouts and presenter view.

Notes are not yet supported for other slide formats, but the notes will not appear on the slides themselves.

Columns

To put material in side by side columns, you can use a native div container with class columns, containing two or more div containers with class column and a width attribute:

    :::::::::::::: {.columns}
::: {.column width="40%"}
contents...
:::
::: {.column width="60%"}
contents...
:::
::::::::::::::

Note: Specifying column widths does not currently work for PowerPoint.

Additional columns attributes in beamer

The div containers with classes columns and column can optionally have an align attribute. The class columns can optionally have a totalwidth attribute or an onlytextwidth class.

    :::::::::::::: {.columns align=center totalwidth=8em}
::: {.column width="40%"}
contents...
:::
::: {.column width="60%" align=bottom}
contents...
:::
::::::::::::::

The align attributes on columns and column can be used with the values top, top-baseline, center and bottom to vertically align the columns. It defaults to top in columns.

The totalwidthattribute limits the width of the columns to the given value.

    :::::::::::::: {.columns align=top .onlytextwidth}
::: {.column width="40%" align=center}
contents...
:::
::: {.column width="60%"}
contents...
:::
::::::::::::::

The class onlytextwidth sets the totalwidth to \textwidth.

See Section 12.7 of the Beamer User’s Guide for more details.

Frame attributes in beamer

Sometimes it is necessary to add the LaTeX [fragile] option to a frame in beamer (for example, when using the minted environment). This can be forced by adding the fragile class to the heading introducing the slide:

    # Fragile slide {.fragile}

All of the other frame attributes described in Section 8.1 of the Beamer User’s Guide may also be used: allowdisplaybreaks, allowframebreaks, b, c, s, t, environment, label, plain, shrink, standout, noframenumbering, squeeze. allowframebreaks is recommended especially for bibliographies, as it allows multiple slides to be created if the content overfills the frame:

    # References {.allowframebreaks}

In addition, the frameoptions attribute may be used to pass arbitrary frame options to a beamer slide:

    # Heading {frameoptions="squeeze,shrink,customoption=foobar"}

Background in reveal.js, beamer, and pptx

Background images can be added to self-contained reveal.js slide shows, beamer slide shows, and pptx slide shows.

On all slides (beamer, reveal.js, pptx)

With beamer and reveal.js, the configuration option background-image can be used either in the YAML metadata block or as a command-line variable to get the same image on every slide.

Note that for reveal.js, the background-image will be used as a parallaxBackgroundImage (see below).

For pptx, you can use a --reference-doc in which background images have been set on the relevant layouts.

parallaxBackgroundImage(reveal.js)

For reveal.js, there is also the reveal.js-native option parallaxBackgroundImage, which produces a parallax scrolling background. You must also set parallaxBackgroundSize, and can optionally set parallaxBackgroundHorizontaland parallaxBackgroundVertical to configure the scrolling behaviour. See the reveal.js documentation for more details about the meaning of these options.

In reveal.js’s overview mode, the parallaxBackgroundImage will show up only on the first slide.

On individual slides (reveal.js, pptx)

To set an image for a particular reveal.js or pptx slide, add {background-image="/path/to/image"}to the first slide-level heading on the slide (which may even be empty).

As the HTML writers pass unknown attributes through, other reveal.js background settings also work on individual slides, including background-size, background-repeat, background-color, transition, and transition-speed. (The data- prefix will automatically be added.)

Note: data-background-image is also supported in pptx for consistency with reveal.js – if background-image isn’t found, data-background-imagewill be checked.

On the title slide (reveal.js, pptx)

To add a background image to the automatically generated title slide for reveal.js, use the title-slide-attributes variable in the YAML metadata block. It must contain a map of attribute names and values. (Note that the data- prefix is required here, as it isn’t added automatically.)

For pptx, pass a --reference-doc with the background image set on the “Title Slide” layout.

Example (reveal.js)

    ---
title: My Slide Show
parallaxBackgroundImage: /path/to/my/background_image.png
title-slide-attributes:
    data-background-image: /path/to/title_image.png
    data-background-size: contain
---

## Slide One

Slide 1 has background_image.png as its background.

## {background-image="/path/to/special_image.jpg"}

Slide 2 has a special image for its background, even though the heading has no content.

EPUBs

EPUB Metadata

EPUB metadata may be specified using the --epub-metadata option, but if the source document is Markdown, it is better to use a YAML metadata block. Here is an example:

    ---
title:
- type: main
  text: My Book
- type: subtitle
  text: An investigation of metadata
creator:
- role: author
  text: John Smith
- role: editor
  text: Sarah Jones
identifier:
- scheme: DOI
  text: doi:10.234234.234/33
publisher:  My Press
rights: © 2007 John Smith, CC BY-NC
ibooks:
  version: 1.3.4
...

The following fields are recognized:

identifier Either a string value or an object with fields text and scheme. Valid values for scheme are ISBN-10, GTIN-13, UPC, ISMN-10, DOI, LCCN, GTIN-14, ISBN-13, Legal deposit number, URN, OCLC, ISMN-13, ISBN-A, JP, OLCC. title Either a string value, or an object with fields file-as and type, or a list of such objects. Valid values for type are main, subtitle, short, collection, edition, extended. creator Either a string value, or an object with fields role, file-as, and text, or a list of such objects. Valid values for role are MARC relators, but pandoc will attempt to translate the human-readable versions (like “author” and “editor”) to the appropriate marc relators. contributor Same format as creator. date A string value in YYYY-MM-DD format. (Only the year is necessary.) Pandoc will attempt to convert other common date formats. lang (or legacy: language) A string value in BCP 47 format. Pandoc will default to the local language if nothing is specified. subject Either a string value, or an object with fields text, authority, and term, or a list of such objects. Valid values for authority are either a reserved authority value (currently AAT, BIC, BISAC, CLC, DDC, CLIL, EuroVoc, MEDTOP, LCSH, NDC, Thema, UDC, and WGS) or an absolute IRI identifying a custom scheme. Valid values for term are defined by the scheme. description A string value. type A string value. format A string value. relation A string value. coverage A string value. rights A string value. belongs-to-collection A string value. Identifies the name of a collection to which the EPUB Publication belongs. group-position The group-position field indicates the numeric position in which the EPUB Publication belongs relative to other works belonging to the same belongs-to-collection field. cover-image A string value (path to cover image). css (or legacy: stylesheet) A string value (path to CSS stylesheet). page-progression-direction Either ltr or rtl. Specifies the page-progression-directionattribute for the spine element. accessModes An array of strings (schema). Defaults to ["textual"]. accessModeSufficient An array of strings (schema). Defaults to ["textual"]. accessibilityHazards An array of strings (schema). Defaults to ["none"]. accessibilityFeatures

An array of strings (schema). Defaults to

    - "alternativeText"
- "readingOrder"
- "structuralNavigation"
- "tableOfContents"

accessibilitySummary A string value. ibooks

iBooks-specific metadata, with the following fields:

The epub:type attribute

For epub3 output, you can mark up the heading that corresponds to an EPUB chapter using the epub:type attribute. For example, to set the attribute to the value prologue, use this Markdown:

    # My chapter {epub:type=prologue}

Which will result in:

    <body epub:type="frontmatter">
  <section epub:type="prologue">
    <h1>My chapter</h1>

Pandoc will output <body epub:type="bodymatter">, unless you use one of the following values, in which case either frontmatter or backmatter will be output.

epub:type of first section epub:type of body
prologue frontmatter
abstract frontmatter
acknowledgments frontmatter
copyright-page frontmatter
dedication frontmatter
credits frontmatter
keywords frontmatter
imprint frontmatter
contributors frontmatter
other-credits frontmatter
errata frontmatter
revision-history frontmatter
titlepage frontmatter
halftitlepage frontmatter
seriespage frontmatter
foreword frontmatter
preface frontmatter
frontispiece frontmatter
appendix backmatter
colophon backmatter
bibliography backmatter
index backmatter

Linked media

By default, pandoc will download media referenced from any <img>, <audio>, <video> or <source> element present in the generated EPUB, and include it in the EPUB container, yielding a completely self-contained EPUB. If you want to link to external media resources instead, use raw HTML in your source and add data-external="1" to the tag with the srcattribute. For example:

    <audio controls="1">
  <source src="https://example.com/music/toccata.mp3"
          data-external="1" type="audio/mpeg">
  </source>
</audio>

If the input format already is HTML then data-external="1" will work as expected for <img>elements. Similarly, for Markdown, external images can be declared with ![img](url){external=1}. Note that this only works for images; the other media elements have no native representation in pandoc’s AST and require the use of raw HTML.

EPUB styling

By default, pandoc will include some basic styling contained in its epub.css data file. (To see this, use pandoc --print-default-data-file epub.css.) To use a different CSS file, just use the --csscommand line option. A few inline styles are defined in addition; these are essential for correct formatting of pandoc’s HTML output.

The document-cssvariable may be set if the more opinionated styling of pandoc’s default HTML templates is desired (and in that case the variables defined in Variables for HTMLmay be used to fine-tune the style).

Chunked HTML

pandoc -t chunkedhtmlwill produce a zip archive of linked HTML files, one for each section of the original document. Internal links will automatically be adjusted to point to the right place, images linked to under the working directory will be incorporated, and navigation links will be added. In addition, a JSON file sitemap.json will be included describing the hierarchical structure of the files.

If an output file without an extension is specified, then it will be interpreted as a directory and the zip archive will be automatically unpacked into it (unless it already exists, in which case an error will be raised). Otherwise a .zip file will be produced.

The navigation links can be customized by adjusting the template. By default, a table of contents is included only on the top page. To include it on every page, set the toc variable manually.

Jupyter notebooks

When creating a Jupyter notebook, pandoc will try to infer the notebook structure. Code blocks with the class code will be taken as code cells, and intervening content will be taken as Markdown cells. Attachments will automatically be created for images in Markdown cells. Metadata will be taken from the jupyter metadata field. For example:

    ---
title: My notebook
jupyter:
  nbformat: 4
  nbformat_minor: 5
  kernelspec:
     display_name: Python 2
     language: python
     name: python2
  language_info:
     codemirror_mode:
       name: ipython
       version: 2
     file_extension: ".py"
     mimetype: "text/x-python"
     name: "python"
     nbconvert_exporter: "python"
     pygments_lexer: "ipython2"
     version: "2.7.15"
---

# Lorem ipsum

**Lorem ipsum** dolor sit amet, consectetur adipiscing elit. Nunc luctus
bibendum felis dictum sodales.


print("hello")

Pyout

from IPython.display import HTML
HTML("""
<script>
console.log("hello");
</script>
<b>HTML</b>
""")

Image

This image image will be included as a cell attachment.


If you want to add cell attributes, group cells differently, or add output to code cells, then you need to include divs to indicate the structure. You can use either [fenced divs](https://pandoc.org/MANUAL.html#extension-fenced_divs) or [native divs](https://pandoc.org/MANUAL.html#extension-native_divs) for this. Here is an example:


:::::: {.cell .markdown}

Lorem

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc luctus
bibendum felis dictum sodales.
:::::
::::: {.cell .code execution_count=1}
print("hello")

::: {.output .stream .stdout}

hello

::: :::::: :::::: {.cell .code execution_count=2}

from IPython.display import HTML
HTML("""
<script>
console.log("hello");
</script>
<b>HTML</b>
""")

::: {.output .execute_result execution_count=2}

HTML hello

::: ::::::


If you include raw HTML or TeX in an output cell, use the [raw attribute](https://pandoc.org/MANUAL.html#extension-raw_attribute), as shown in the last cell of the example above. Although pandoc can process “bare” raw HTML and TeX, the result is often interspersed raw elements and normal textual elements, and in an output cell pandoc expects a single, connected raw block. To avoid using raw HTML or TeX except when marked explicitly using raw attributes, we recommend specifying the extensions `-raw_html-raw_tex+raw_attribute`when translating between Markdown and ipynb notebooks.

Note that options and extensions that affect reading and writing of Markdown will also affect Markdown cells in ipynb notebooks. For example, [`--wrap=preserve`](https://pandoc.org/MANUAL.html#option--wrap) will preserve soft line breaks in Markdown cells; [`--markdown-headings=setext`](https://pandoc.org/MANUAL.html#option--markdown-headings)will cause Setext-style headings to be used; and [`--preserve-tabs`](https://pandoc.org/MANUAL.html#option--preserve-tabs[) will prevent tabs from being turned to spaces.

## Syntax highlighting

Pandoc will automatically highlight syntax in [fenced code blocks](https://pandoc.org/MANUAL.html#fenced-code-blocks) that are marked with a language name. The Haskell library [skylighting](https://github.com/jgm/skylighting) is used for highlighting. Currently highlighting is supported only for HTML, EPUB, Docx, Ms, Man, and LaTeX/PDF output. To see a list of language names that pandoc will recognize, type `pandoc --list-highlight-languages`.

The color scheme can be selected using the [`--highlight-style`](https://pandoc.org/MANUAL.html#option--highlight-style) option. The default color scheme is `pygments`, which imitates the default color scheme used by the Python library pygments (though pygments is not actually used to do the highlighting). To see a list of highlight styles, type `pandoc --list-highlight-styles`.

If you are not satisfied with the predefined styles, you can use [`--print-highlight-style`](https://pandoc.org/MANUAL.html#option--print-highlight-style) to generate a JSON `.theme`file which can be modified and used as the argument to [`--highlight-style`](https://pandoc.org/MANUAL.html#option--highlight-style). To get a JSON version of the `pygments` style, for example:


pandoc --print-highlight-style pygments > my.theme


Then edit `my.theme` and use it like this:


pandoc --highlight-style my.theme


If you are not satisfied with the built-in highlighting, or you want to highlight a language that isn’t supported, you can use the [`--syntax-definition`](https://pandoc.org/MANUAL.html#option--syntax-definition) option to load a [KDE-style XML syntax definition file](https://docs.kde.org/stable5/en/kate/katepart/highlight.html). Before writing your own, have a look at KDE’s [repository of syntax definitions](https://github.com/KDE/syntax-highlighting/tree/master/data/syntax).

To disable highlighting, use the [`--no-highlight`](https://pandoc.org/MANUAL.html#option--no-highlight) option.

## Custom Styles

Custom styles can be used in the docx, odt and ICML formats.

## Output

By default, pandoc’s odt, docx and ICML output applies a predefined set of styles for blocks such as paragraphs and block quotes, and uses largely default formatting (italics, bold) for inlines. This will work for most purposes, especially alongside a [reference doc](https://pandoc.org/MANUAL.html#option--reference-doc) file. However, if you need to apply your own styles to blocks, or match a preexisting set of styles, pandoc allows you to define custom styles for blocks and text using `div`s and `span`s, respectively.

If you define a `div` or `span` with the attribute `custom-style`, pandoc will apply your specified style to the contained elements (with the exception of elements whose function depends on a style, like headings, code blocks, block quotes, or links). So, for example, using the `bracketed_spans`syntax,


[Get out]{custom-style="Emphatically"}, he said.


would produce a file with “Get out” styled with character style `Emphatically`. Similarly, using the `fenced_divs`syntax,


Dickinson starts the poem simply:

::: {custom-style="Poetry"} | A Bird came down the Walk--- | He did not know I saw--- :::


would style the two contained lines with the `Poetry` paragraph style.

Styles will be defined in the output file as inheriting from normal text (docx) or Default Paragraph Style (odt), if the styles are not yet in your [reference doc](https://pandoc.org/MANUAL.html#option--reference-doc). If they are already defined, pandoc will not alter the definition.

This feature allows for greatest customization in conjunction with [pandoc filters](https://pandoc.org/filters.html). If you want all paragraphs after block quotes to be indented, you can write a filter to apply the styles necessary. If you want all italics to be transformed to the `Emphasis` character style (perhaps to change their color), you can write a filter which will transform all italicized inlines to inlines within an `Emphasis` custom-style `span`.

For docx or odt output, you don’t need to enable any extensions for custom styles to work.

## Input

The docx reader, by default, only reads those styles that it can convert into pandoc elements, either by direct conversion or interpreting the derivation of the input document’s styles.

By enabling the [`styles` extension](https://pandoc.org/MANUAL.html#ext-styles) in the docx reader ([`-f docx+styles`](https://pandoc.org/MANUAL.html#option--from)), you can produce output that maintains the styles of the input document, using the `custom-style`class. Paragraph styles are interpreted as divs, while character styles are interpreted as spans.

For example, using the `custom-style-reference.docx`file in the test directory, we have the following different outputs:

Without the `+styles`extension:


$ pandoc test/docx/custom-style-reference.docx -f docx -t markdown

This is some text.

This is text with an emphasized text style. And this is text with a strengthened text style.

Here is a styled paragraph that inherits from Block Text.


And with the extension:


$ pandoc test/docx/custom-style-reference.docx -f docx+styles -t markdown

::: {custom-style="First Paragraph"} This is some text. ::: ::: {custom-style="Body Text"} This is text with an [emphasized]{custom-style="Emphatic"} text style. And this is text with a [strengthened]{custom-style="Strengthened"} text style. ::: ::: {custom-style="My Block Style"}

Here is a styled paragraph that inherits from Block Text.

:::


With these custom styles, you can use your input document as a reference-doc while creating docx output (see below), and maintain the same styles in your input and output files.

## Custom readers and writers

Pandoc can be extended with custom readers and writers written in [Lua](https://www.lua.org/). (Pandoc includes a Lua interpreter, so Lua need not be installed separately.)

To use a custom reader or writer, simply specify the path to the Lua script in place of the input or output format. For example:


pandoc -t data/sample.lua

pandoc -f my_custom_markup_language.lua -t latex -s


If the script is not found relative to the working directory, it will be sought in the `custom` subdirectory of the user data directory (see [`--data-dir`](https://pandoc.org/MANUAL.html#option--data-dir)).

A custom reader is a Lua script that defines one function, Reader, which takes a string as input and returns a Pandoc AST. See the [Lua filters documentation](https://pandoc.org/lua-filters.html) for documentation of the functions that are available for creating pandoc AST elements. For parsing, the [lpeg](http://www.inf.puc-rio.br/~roberto/lpeg/) parsing library is available by default. To see a sample custom reader:


pandoc --print-default-data-file creole.lua


If you want your custom reader to have access to reader options (e.g. the tab stop setting), you give your Reader function a second `options`parameter.

A custom writer is a Lua script that defines a function that specifies how to render each element in a Pandoc AST. See the [djot-writer.lua](https://github.com/jgm/djot.lua/blob/main/djot-writer.lua)for a full-featured example.

Note that custom writers have no default template. If you want to use [`--standalone`](https://pandoc.org/MANUAL.html#option--standalone) with a custom writer, you will need to specify a template manually using [`--template`](https://pandoc.org/MANUAL.html#option--template) or add a new default template with the name `default.NAME_OF_CUSTOM_WRITER.lua`to the `templates`subdirectory of your user data directory (see [Templates](https://pandoc.org/MANUAL.html#templates)).

## Reproducible builds

Some of the document formats pandoc targets (such as EPUB, docx, and ODT) include build timestamps in the generated document. That means that the files generated on successive builds will differ, even if the source does not. To avoid this, set the `SOURCE_DATE_EPOCH` environment variable, and the timestamp will be taken from it instead of the current time. `SOURCE_DATE_EPOCH` should contain an integer unix timestamp (specifying the number of seconds since midnight UTC January 1, 1970).

Some document formats also include a unique identifier. For EPUB, this can be set explicitly by setting the `identifier` metadata field (see [EPUB Metadata](https://pandoc.org/MANUAL.html#epub-metadata), above).

## Accessible PDFs and PDF archiving standards

PDF is a flexible format, and using PDF in certain contexts requires additional conventions. For example, PDFs are not accessible by default; they define how characters are placed on a page but do not contain semantic information on the content. However, it is possible to generate accessible PDFs, which use tagging to add semantic information to the document.

Pandoc defaults to LaTeX to generate PDF. Tagging support in LaTeX is in development and not readily available, so PDFs generated in this way will always be untagged and not accessible. This means that alternative engines must be used to generate accessible PDFs.

The PDF standards PDF/A and PDF/UA define further restrictions intended to optimize PDFs for archiving and accessibility. Tagging is commonly used in combination with these standards to ensure best results.

Note, however, that standard compliance depends on many things, including the colorspace of embedded images. Pandoc cannot check this, and external programs must be used to ensure that generated PDFs are in compliance.

## ConTeXt

ConTeXt always produces tagged PDFs, but the quality depends on the input. The default ConTeXt markup generated by pandoc is optimized for readability and reuse, not tagging. Enable the [`tagging`](https://pandoc.org/MANUAL.html#extension--tagging) format extension to force markup that is optimized for tagging. This can be combined with the `pdfa` variable to generate standard-compliant PDFs. E.g.:


pandoc --to=context+tagging -V pdfa=3a


A recent `context`version should be used, as older versions contained a bug that lead to invalid PDF metadata.

## WeasyPrint

The HTML-based engine WeasyPrint includes experimental support for PDF/A and PDF/UA since version 57. Tagged PDFs can created with


pandoc --pdf-engine=weasyprint \
   --pdf-engine-opt=--pdf-variant=pdf/ua-1 ...


The feature is experimental and standard compliance should not be assumed.

## Prince XML

The non-free HTML-to-PDf converter `prince` has extensive support for various PDF standards as well as tagging. E.g.:


pandoc --pdf-engine=prince \
   --pdf-engine-opt=--tagged-pdf ...


See the prince documentation for more info.

## Word Processors

Word processors like LibreOffice and MS Word can also be used to generate standardized and tagged PDF output. Pandoc does not support direct conversions via these tools. However, pandoc can convert a document to a `docx` or `odt` file, which can then be opened and converted to PDF with the respective word processor. See the documentation for [Word](https://support.microsoft.com/en-us/office/create-accessible-pdfs-064625e0-56ea-4e16-ad71-3aa33bb4b7ed)and [LibreOffice](https://help.libreoffice.org/7.1/en-US/text/shared/01/ref_pdf_export_general.html).

## Running pandoc as a web server

If you rename (or symlink) the pandoc executable to `pandoc-server`, or if you call pandoc with `server` as the first argument, it will start up a web server with a JSON API. This server exposes most of the conversion functionality of pandoc. For full documentation, see the [pandoc-server](https://github.com/jgm/pandoc/blob/master/doc/pandoc-server.md)man page.

If you rename (or symlink) the pandoc executable to `pandoc-server.cgi`, it will function as a CGI program exposing the same API as `pandoc-server`.

`pandoc-server` is designed to be maximally secure; it uses Haskell’s type system to provide strong guarantees that no I/O will be performed on the server during pandoc conversions.

## Running pandoc as a Lua interpreter

Calling the pandoc executable under the name `pandoc-lua` or with `lua` as the first argument will make it function as a standalone Lua interpreter. The behavior is mostly identical to that of the [standalone `lua` executable](https://www.lua.org/manual/5.4/manual.html#7), version 5.4. For full documentation, see the [pandoc-lua](https://github.com/jgm/pandoc/blob/master/doc/pandoc-lua.md)man page.

## A note on security

 1. Although pandoc itself will not create or modify any files other than those you explicitly ask it create (with the exception of temporary files used in producing PDFs), a filter or custom writer could in principle do anything on your file system. Please audit filters and custom writers very carefully before using them.
    
    
 2. Several input formats (including HTML, Org, and RST) support `include`directives that allow the contents of a file to be included in the output. An untrusted attacker could use these to view the contents of files on the file system. (Using the [`--sandbox`](https://pandoc.org/MANUAL.html#option--sandbox[) option can protect against this threat.)
    
    
 3. Several output formats (including RTF, FB2, HTML with [`--self-contained`](https://pandoc.org/MANUAL.html#option--self-contained[), EPUB, Docx, and ODT) will embed encoded or raw images into the output file. An untrusted attacker could exploit this to view the contents of non-image files on the file system. (Using the [`--sandbox`](https://pandoc.org/MANUAL.html#option--sandbox[) option can protect against this threat, but will also prevent including images in these formats.)
    
    
 4. If your application uses pandoc as a Haskell library (rather than shelling out to the executable), it is possible to use it in a mode that fully isolates pandoc from your file system, by running the pandoc operations in the `PandocPure` monad. See the document [Using the pandoc API](https://pandoc.org/using-the-pandoc-api.html) for more details. (This corresponds to the use of the [`--sandbox`](https://pandoc.org/MANUAL.html#option--sandbox[) option on the command line.)
    
    
 5. Pandoc’s parsers can exhibit pathological performance on some corner cases. It is wise to put any pandoc operations under a timeout, to avoid DOS attacks that exploit these issues. If you are using the pandoc executable, you can add the command line options `+RTS -M512M -RTS`(for example) to limit the heap size to 512MB. Note that the `commonmark` parser (including `commonmark_x` and `gfm`) is much less vulnerable to pathological performance than the `markdown` parser, so it is a better choice when processing untrusted input.
    
    
 6. The HTML generated by pandoc is not guaranteed to be safe. If `raw_html` is enabled for the Markdown input, users can inject arbitrary HTML. Even if `raw_html` is disabled, users can include dangerous content in URLs and attributes. To be safe, you should run all HTML generated from untrusted user input through an HTML sanitizer.
    
    

## Authors

Copyright 2006–2022 John MacFarlane (jgm@berkeley.edu). Released under the [GPL](https://www.gnu.org/copyleft/gpl.html), version 2 or greater. This software carries no warranty of any kind. (See COPYRIGHT for full copyright and warranty notices.) For a full list of contributors, see the file AUTHORS.md in the pandoc source code.

 1. The point of this rule is to ensure that normal paragraphs starting with people’s initials, like
    
    ```
        B. Russell won a Nobel Prize (but not for "On Denoting").
    ```
    
    do not get treated as list items.
    
    This rule will not prevent
    
    ```
        (C) 2007 Joe Smith
    ```
    
    from being interpreted as a list item. In this case, a backslash escape can be used:
    
    ```
        (C\) 2007 Joe Smith
    ```
    
    [↩︎](https://pandoc.org/MANUAL.html#fnref1)
 2. I have been influenced by the suggestions of [David Wheeler](https://justatheory.com/2009/02/modest-markdown-proposal/).[↩︎](https://pandoc.org/MANUAL.html#fnref2)
    
    
 3. This scheme is due to Michel Fortin, who proposed it on the [Markdown discussion list](http://six.pairlist.net/pipermail/markdown-discuss/2005-March/001097.html).[↩︎](https://pandoc.org/MANUAL.html#fnref3)
    
    
 4. To see why laziness is incompatible with relaxing the requirement of a blank line between items, consider the following example:
    
    ```
        bar
    :    definition
    foo
    :    definition
    ```
    
    Is this a single list item with two definitions of “bar,” the first of which is lazily wrapped, or two list items? To remove the ambiguity we must either disallow lazy wrapping or require a blank line between list items.[↩︎](https://pandoc.org/MANUAL.html#fnref4)