About The Markdown Outline Extractor

The Markdown Outline Extractor reads a Markdown document and turns its headings into a compact outline. It is useful for reviewing article structure, documentation pages, changelogs, README files, and long notes before publishing or editing.

Extraction runs locally in your browser. The tool looks for ATX-style headings, from # H1 through ###### H6, and skips headings inside fenced code blocks.

How to Extract a Markdown Outline Online

1. Paste your Markdown document into the input box.
2. Click Extract Outline.
3. Review the heading hierarchy in the output.
4. Copy the outline for editing notes, documentation review, or a table-of-contents draft.

What It Detects

Supported headings:
- ATX headings that start with one to six # characters.
- Optional closing hashes at the end of a heading.

Skipped content:
- Headings inside fenced code blocks.
- Setext headings written with underline-style === or --- markers.

Common Use Cases

• Audit documentation hierarchy before publishing.
• Find missing or out-of-order sections in a long article.
• Create a quick outline for review comments.
• Check whether a README has a clear structure.

Quick FAQ

Does pasted Markdown leave my browser?
No. Outline extraction is designed to run in the browser.

Why are some headings missing?
The heading may not use Markdown heading syntax, may be inside code fences, or may be generated by HTML.

Does it include duplicate heading text?
Yes. Duplicate headings can appear separately because they represent different outline positions.

Can it validate document structure?
No. It extracts headings, but it does not judge whether the hierarchy is editorially correct.