H1 Checker
Paste a page's HTML source to check how many H1 tags it has, and see their text.
Everything runs locally in your browser — nothing is sent anywhere. This tool checks the HTML you paste in, not a live URL.
Result
Paste HTML on the left to check its H1 tags.
How to use it
- 1View a page's source (Ctrl/Cmd+U) and copy it.
- 2Paste it into the box.
- 3Check the result for H1 count issues.
Is my file uploaded?
No — the check happens locally in your browser on the HTML you paste in.
FAQ
- Is it wrong to have zero or multiple H1 tags?
- Most SEO guidance recommends exactly one H1 per page as the main heading, though modern HTML5 sectioning technically allows more — treat it as a best practice, not a hard rule.