H1 & Heading Structure Checker
Paste HTML or Markdown to check your H1 and see the full heading outline as a tree. Catches the issues that hurt SEO and accessibility: multiple H1s, skipped levels, and empty headings.
Outline
Your H1
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
A page should use one H1 that describes its main topic. HTML5 technically allows more, but a single clear H1 stays the safest and most widely recommended approach for SEO and accessibility.
Skipping 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.
Yes, the analyzer works with Markdown. Paste either HTML or Markdown, and it detects # headings and h1 to h6 tags alike.
No, your content is not uploaded. The analysis runs locally in your browser.
An H1 reads best at 20 to 60 characters: long enough to state the page's topic with the primary keyword, short enough to scan in one glance. Unlike the meta title, Google does not truncate an H1, but a rambling one dilutes the topic signal for readers and search engines alike.
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