Canonical URL Checker
Paste a page's HTML source to check whether it has a canonical tag, and whether there's more than one.
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 canonical tag.
How to use it
- 1View a page's source (Ctrl/Cmd+U) and copy it.
- 2Paste it into the box.
- 3Check the result for canonical tag issues.
Is my file uploaded?
No — the check happens locally in your browser on the HTML you paste in.
FAQ
- Why does a page need a canonical tag?
- It tells search engines which URL is the 'main' version when the same content is reachable through multiple URLs, avoiding duplicate content issues.