Heading Structure Checker
Free heading structure checker: list every H1-H6 on a page and flag problems.
Quick answer: enter your details below and click Check headings — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Paste your page HTML.
- Click Check headings.
- Fix multiple H1s or skipped levels.
About this tool
The Heading Structure Checker extracts every heading tag in order, counts them and warns when a page has zero or multiple H1 tags — the two most common heading mistakes.
Frequently asked questions
Can a page have more than one H1?
HTML5 allows it, but one H1 per page is the safest, clearest convention.
Do skipped levels matter?
Jumping from H2 to H4 confuses screen readers and outlines. Keep levels in order.