Is your heading outline actually structured?

An H1 is the page's single top-level label. Zero H1s leaves the page without a stated topic; more than one gives readers and crawlers two competing topics to parse. One H1 per page keeps the outline unambiguous.

Yes, for structure, accessibility, and parsing, not for any ranking promise. A heading outline that jumps from H2 straight to H4 breaks the logical nesting that screen readers and outline-based parsers rely on. It does not directly cause or prevent any search result.

AI answer engines like ChatGPT, Perplexity, and Gemini are matching a user's question to an answer somewhere on the web. A heading phrased as 'How does X work?' maps directly onto that query. A heading phrased as a generic label like 'Overview' gives the engine nothing to match against.

Long enough to state a specific claim or question, short enough to scan in one glance. This tool flags anything under 3 characters as too short to mean anything, and anything over 70 characters as likely to be a full sentence pretending to be a heading.

No. Visual size and semantic level are separate concerns. An H3 can be styled larger than an H2 if the design calls for it. What matters for this tool is the underlying tag order in the HTML, not how big anything looks on screen.

Our server fetches the page's HTML once, pulls out every H1-H6 tag in document order (dropping headings inside nav elements), and grades that list in your browser. Nothing about the page or the URL is stored afterward.