Markdown heading numberer

What is this Markdown heading numberer?

A free, browser-based tool that inserts hierarchical section numbers (1, 1.1, 1.2 …) into the ATX headings (# … ######) of your Markdown. Pick how deep to number and whether to use a dotted (1.1) or trailing-dot (1.1.) format. Headings inside fenced code blocks are skipped, and re-running is idempotent. Everything runs locally in your browser, so your text is never uploaded.

How to use it

1. Paste your Markdown into the box on the left.
2. Choose the maximum heading depth to number (H1–H6).
3. Pick the number format — dotted (1.1) or trailing dot (1.1.).
4. Copy the numbered Markdown or download it as a .md file.

Common use cases

• Adding section numbers to a specification, manual, or RFC written in Markdown.
• Preparing numbered headings for a document that will be exported to PDF or print.
• Renumbering headings consistently after restructuring a long document.

Other text tools

• Heading number remover