Free tool
Heading Structure Checker
Paste the HTML of a page and see the heading outline the way a crawler reads it. We flag missing H1s, duplicate H1s, and skipped heading levels.
We fetch the page and pull its real h1–h6 elements. Or paste HTML below.
Paste HTML above to see the heading outline.
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What this means
Headings are the outline of your page. Search engines and screen readers both use them to understand structure, so the order matters as much as the words. One h1 names the page, and each level below it should step down by one, never jump.
A skipped level, like an h2 followed by an h4, leaves a gap in that outline. The gap rarely changes the visual layout. It still makes the page harder to parse for readers who depend on structure.
This checks the markup you paste. The full audit reads your live, rendered HTML. It catches headings injected outside the source file.
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This checked one thing. The full audit checks forty.