Heading Outline

Extract an H1–H6 heading outline and check the structure.

  • 100% free
  • Private in browser
  • No signup
  • No watermarks

Outline (0 headings)

Paste content with headings to see the outline.

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About Heading Outline

A clean heading hierarchy helps both readers and search engines follow your content. Heading Outline on TheToolss extracts every H1–H6 from pasted HTML or Markdown and shows the outline as an indented tree. It flags common problems — a missing or duplicate H1, a first heading that is not an H1, empty headings, and level jumps like H2 straight to H4. Fix the structure before you publish so your page is easy to skim and crawl. It runs in your browser — free, private, and no signup.

How to use Heading Outline

  1. Paste your page HTML or Markdown.
  2. View the extracted H1–H6 outline.
  3. Fix any warnings about missing H1 or skipped levels.

Key features

  • Works with HTML and Markdown headings
  • Indented H1–H6 outline view
  • Detects missing and duplicate H1
  • Flags skipped heading levels
  • Private in-browser analysis

Frequently asked questions

Is the Heading Outline tool free?
Yes. It is free on TheToolss with no signup.
Should a page have only one H1?
A single, descriptive H1 is the widely recommended practice, with H2–H6 nested beneath it for sections and subsections.
Why avoid skipping heading levels?
Jumping from H2 to H4 breaks the logical outline for screen readers and can make structure harder to parse. Keep levels sequential.
Does it read HTML and Markdown?
Yes. It auto-detects HTML <h1>–<h6> tags, and otherwise parses Markdown # headings.
Is my content uploaded?
No. Everything is parsed locally in your browser.
Heading Outline Checker — H1–H6 Structure Tool | TheToolss