AI engines lift a section, not a wall of text — clean heading hierarchy makes each passage extractable. Paste HTML/markdown or fetch a URL to see the H1–H6 outline and structural issues.
A heading structure checker validates that a page's headings form one logical outline: a single H1 that names the page, then H2s and H3s that nest without skipping a level (never jumping H2 straight to H4). A broken outline hides your document's structure from search crawlers and AI answer engines, which walk the heading tree to learn what each section answers — so a clean hierarchy makes your content easier to index, feature in snippets, and quote in AI Overviews.
The H1 tells crawlers and AI engines the page's main topic in one line, so a single H1 keeps that signal unambiguous. Multiple H1s split the primary-topic signal and can flatten your outline, while zero H1 leaves the page with no titled root.
Yes — a skipped level breaks the logical outline that crawlers, screen readers, and AI answer engines use to map sections to subtopics. It rarely triggers a penalty on its own, but it weakens content parsing and accessibility, which both feed ranking and citation.
Start with one H1, then use H2 for main sections and H3 for subpoints within them, never skipping a level on the way down. You can jump back up (H3 to H2 for a new section), but each step deeper should move only one level at a time.
Yes — paste markdown (`#`, `##`, `###`) or HTML (`<h1>`–`<h6>`), or fetch a live URL, and the checker maps all three to the same heading tree. The hierarchy rules are identical regardless of the source format.
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