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What is CommonMark?

CommonMark is a specification that defines precise, unambiguous parsing rules for Markdown. It exists because the original Markdown description left many cases undefined, so different implementations disagreed.

Primary sources

Specifications cited by the tools below whose own titles define CommonMark.

10 tools that work with CommonMark

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Text Tools6

Markdown Editor & ViewerWrite markdown with a live preview, outline, formatting toolbar and one-click HTML, PDF or .md export.Markdown to DOCX ConverterExport Markdown as a DOCX with Word heading styles, lists and grid tables.Markdown to JSON ConverterParse Markdown into a structured JSON document tree with headings, lists and tables.Markdown to Plain TextStrip Markdown formatting down to clean, readable plain text.Markdown to Presentation SlidesTurn a Markdown outline into a real PowerPoint deck — one slide per heading.Markdown to Word ConverterConvert Markdown into a real, editable Word (.docx) document with proper heading styles.

Data & Format Tools2

Markdown FormatterTidy Markdown — normalise headings, lists, tables and emphasis markers.Markdown to HTML ConverterConvert Markdown to clean HTML, or turn existing HTML back into Markdown.

PDF Tools1

Markdown to PDFTurn Markdown into a properly typeset PDF with real headings, lists, tables and code blocks.

Samples & Mock Data1

Sample Markdown GeneratorGenerate Markdown documents exercising every feature — tables, code, footnotes, task lists and more.

Related terms

Terms that appear alongside CommonMark on the same tools.

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