Free · Find skipped and repeated headings

Markdown Heading Checker

Check for a missing H1, level jumps, empty headings, and duplicate anchor names.

  • markdown-it 14 parser
  • Private in your browser
  • Raw HTML stays off

Check headings

Paste Markdown or open a local .md file. Raw HTML stays off in every preview.

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Add Markdown633 / 120,000 characters
Safe local parsermarkdown-it 14.1.0 · raw HTML disabled
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See the resultReady when you are
Your result will appear here

Nothing is uploaded, and links are never opened by the checker.

Three simple steps

How to use it

  1. Paste the full document.
  2. Review heading order warnings.
  3. Fix the outline from top to bottom.

Your Markdown stays on this device

markdown-it reads the document inside this browser tab. Bookify does not upload or save it. Raw HTML is shown as text, unsafe link types stay unclickable, and the checker never visits a link.