Heading Structure Analyzer
Paste HTML or Markdown to see your heading outline as a tree and catch the issues that hurt SEO and accessibility — multiple H1s, skipped levels, and empty headings.
Outline
Issues
Why heading hierarchy matters
Headings give a page its outline. Search engines use that outline to understand structure and context, and screen readers use it to let people navigate by section. A clean H1 → H2 → H3 hierarchy improves both SEO and accessibility; a broken one confuses both.
Common problems this catches
Multiple H1s on a page, levels skipped (an H2 jumping straight to an H4), empty headings, and headings used purely for visual size rather than structure. The analyzer flags each so you can fix the outline before it costs you.
HTML or Markdown
Paste a full HTML document or Markdown source. The tool extracts every heading, infers the level, and renders an indented tree with inline warnings — a fast way to audit a page's structure without reading the whole DOM.
Frequently asked questions
Should a page have only one H1?
As a best practice, yes — one H1 that describes the page's main topic. While HTML5 technically allows more, a single clear H1 remains the safest, most widely-recommended approach for SEO.
What's wrong with skipping heading levels?
Jumping from H2 to H4 breaks the logical outline and confuses assistive technology. Headings should descend one level at a time (H2 → H3 → H4) and can jump back up freely.
Does it work with Markdown?
Yes. Paste either HTML or Markdown — the analyzer detects # headings and h1–h6 tags alike.
Is my content uploaded?
No. The analysis is performed locally in your browser.
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