Free Tool
HTML Headings Checker (H1–H6)
Input a URL or paste HTML to see the complete heading hierarchy tree. Flags missing H1s, multiple H1s, and skipped heading levels.
Note: Some checks require fetching external URLs, which may be blocked by CORS restrictions in the browser. For URLs that can't be fetched directly, try pasting the HTML source instead. Full functionality can be connected via a server-side API proxy.
Why this matters
Heading structure is one of the most important on-page SEO signals. Search engines and AI models use headings to understand content hierarchy and topic relationships. Missing H1s, multiple H1s, or skipped levels (e.g., H2 → H4) confuse crawlers and hurt both SEO and AI extractability.
FAQ
One. Every page should have exactly one H1 that describes its main topic. Multiple H1s dilute topical relevance and can confuse search engines about the page's primary subject.
Skipped levels happen when you jump from H2 to H4 without an H3 in between. This breaks the logical hierarchy and makes it harder for search engines and AI models to understand content structure.
AI engines like ChatGPT and Perplexity use heading structure to understand content organization. Well-structured headings make your content more extractable and more likely to be cited in AI-generated answers.
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