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A page's headings form an outline, the same way chapters and subheadings organize a book. When that outline is clean, both readers scanning the page and search engines parsing its structure can quickly tell what the page covers and how the pieces relate. This checker parses HTML you paste, extracts every H1 through H6 tag in order, and flags the three problems that most commonly break a heading outline: skipped levels, multiple H1s, and empty headings.
A well-structured page has exactly one H1 stating its main topic, H2s marking the major sections beneath it, and H3s or deeper only where a subsection needs its own subsection. The key rule is sequential nesting on the way down: an H2 can be followed by another H2 or by an H3 that introduces a subsection within it, but it should not jump straight to an H4 without an H3 in between. Moving back up a level, say from an H4 to an H2, is completely normal; it just means one subsection ended and a new major section began.
Skipping a heading level is not a dramatic error, but it breaks the logical structure that headings exist to provide. Screen reader users frequently navigate a page by jumping between headings, and the W3C's accessibility guidance treats sequential heading levels as a best practice precisely because a jump from H2 to H4 can leave someone wondering whether a section was skipped over entirely. The same broken nesting makes it slightly harder for a search engine parsing the page to build an accurate sense of which subtopics sit under which main sections.
If the checker reports more than one H1, keep the one that best states the page's overall topic and demote the others to H2. If it flags a skipped level, either insert the missing intermediate heading if that subsection genuinely deserves one, or drop the deeper heading up to the correct level if a full subsection was never really there. Empty headings, meaning a heading tag with no visible text, usually come from a template rendering issue or a placeholder left in by mistake, and should either be filled in or removed entirely. None of these fixes take long, and a clean heading structure is one of the checks we run as a matter of course during a full content optimization pass.
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