Compatibility Checker

Check which Markdown features your document uses and whether they are compatible with CommonMark, GitHub Flavored Markdown (GFM) and Yandex Flavored Markdown (YFM). Ensure your document renders correctly on the target platform before publishing.

All tools in one screen

Demo

What Compatibility Checker detects

Strikethrough (~~)

~~text~~ is only supported in GFM. Renders as plain text in CommonMark.

Task lists

- [x] task — a GFM extension. Renders as plain text in CommonMark.

Tables

GFM pipe tables with | are not part of the CommonMark standard.

YAML Front Matter

--- metadata block requires a YFM-compatible parser.

Autolinks

Bare URLs without < > are only recognized in GFM. CommonMark requires angle brackets.

Related tools

Quality Checker

Markdown linter: find structure errors, broken links and formatting issues.

Markdown Repair

Fix broken headings, close unclosed code fences, add required blank lines.

TOC Generator

Generate a table of contents from headings and insert it into the document.

Frequently Asked Questions

All tools in one Workspace

Compatibility Checker + Quality Checker — full Markdown document audit.