Free tool
Heading Structure Checker
Paste the HTML of a page and see the heading outline the way a crawler reads it. We flag the three problems that break that outline: a missing h1, more than one h1, and a level that skips a step.
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. It rarely shows on the screen, which is why it survives, but it makes the page harder to parse for the readers who rely on structure most.
This checks the markup you paste. The full audit reads the rendered HTML of your live pages, so it catches headings your framework injects that never appear in the source.
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This checked one thing. The full audit checks forty.