SEO
Heading Structure Checker
Analyze pasted HTML headings from H1 to H6 and check heading order, missing H1 tags, duplicate H1 tags and page outline structure locally.
Tool
Analyze pasted HTML headings from H1 to H6 and check heading order, missing H1 tags, duplicate H1 tags and page outline structure locally.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Paste HTML source to extract and review all H1 to H6 headings. The checker shows the page outline, detects missing or multiple H1 headings, skipped heading levels and empty heading tags.
Examples
- Paste a full HTML page
- Check heading hierarchy before publishing
- Review article outline from HTML
Frequently Asked Questions
Can this tool crawl my page URL?
No. Paste the HTML source manually. The checker does not fetch or crawl live websites.
Is it bad to have more than one H1?
Multiple H1 headings are not always fatal, but a clear single main heading is often easier to understand and audit.
What are skipped heading levels?
Skipped levels happen when the structure jumps, for example from H2 directly to H4. This can make the document outline harder to follow.