Heading structure checker

See the H1–H6 outline of any page and find a missing or duplicate H1, skipped levels, empty headings and headings that run too long.

Free, no signup. Checks one page.

What this tool checks

  • Exactly one H1
  • Skipped levels, such as an H2 followed directly by an H4
  • Empty heading tags
  • Headings over 70 characters
  • The full heading outline, so you can see the page the way a screen reader or crawler does

Why heading structure matters

Headings are the outline of a page. Search engines use them to understand what each section covers, screen reader users jump between them to navigate, and AI assistants often lift a section under a matching heading to answer a question.

A single H1 that states the page topic, followed by H2s for main sections and H3s beneath them, is the clearest structure. Question-style headings that match how people search are especially easy for AI answers to quote.

Frequently asked questions

Can a page have more than one H1?

HTML allows it and Google says it copes, but one H1 that states the page topic is clearer for users, screen readers and crawlers.

Is skipping heading levels bad for SEO?

It's mainly an accessibility issue: screen reader users rely on levels to understand structure. Keeping levels in order also makes the outline clearer for crawlers.

Should headings include keywords?

Use the words people actually search for where they fit naturally. Write headings that describe the section for a reader first.

More free SEO tools

  • AI Crawler CheckerFree check: can ChatGPT, Claude, Perplexity and Gemini crawlers reach your site? Tests robots.txt rules per AI bot, firewall and CDN blocks, and llms.txt..
  • Meta Tag CheckerCheck any page's title tag, meta description, canonical, Open Graph and Twitter Card tags.
  • Robots.txt CheckerFetch and test any site's robots.txt.
  • Schema Markup CheckerSee which schema.org structured data a page has (JSON-LD, Microdata, RDFa), find invalid JSON-LD, and get the markup types you're missing..