HTML Heading Outline Extractor

Extract document heading hierarchy (H1, H2, H3, H4, H5, H6) into an outline tree structure.

How It Works & Processing Standards

Extract document heading hierarchy (H1, H2, H3, H4, H5, H6) into an outline tree structure.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

HTML Heading Outline Extractor is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use HTML Heading Outline Extractor

  1. 1
    Paste HTMLEnter the webpage HTML.
  2. 2
    Inspect Heading TreeView all H1-H6 tags organized by level with their inner text.

Common Use Cases

  • Auditing heading hierarchy for accessibility (a11y), verifying single H1 usage, and generating table of contents
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