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Heading Hierarchy Checker

Find broken heading sequences, duplicate H1s, and skipped levels — the audits most SEO tools miss.

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What this tool checks

The heading hierarchy audit runs five checks on any HTML document or live URL:

  • Single H1 — exactly one <h1> per page is the HTML spec requirement and what Google expects. Multiple H1s dilute the topic signal.
  • Heading sequence — levels should step down consecutively (H1 → H2 → H3). Skipping H2 and jumping to H3 breaks the document outline that screen readers build.
  • Section headings — at least two H2+ headings make a page scannable. Single-heading pages are hard to navigate.
  • Empty headings — <h2></h2> passes the validator but tells screen readers nothing. Every heading needs text.
  • Duplicate heading text — same-level headings with identical text confuse both users and crawlers. Each should be unique.

All analysis runs entirely in your browser. No HTML or URL is ever sent to a server.