Free Canonical URL Checker

Check if a page correctly identifies its preferred version using the rel=canonical tag. Ensure search engines don't penalize you for duplicate content across different URLs.

Free
No signup
Instant results

How to use the Canonical URL Checker

A canonical tag tells search engines which URL is the real version of a page when duplicates exist — get it wrong and Google may rank the wrong page or none at all. This checker reads a page’s canonical tag and confirms it points to a valid URL that matches the page’s final address.

1Enter the page URL you want to check.
2The tool reads the rel=canonical tag and follows redirects.
3Confirm the canonical points to a reachable, matching URL.
4Correct any mismatch so ranking signals aren’t split.

Frequently asked questions

What is a canonical URL?

A canonical URL (rel="canonical") tells search engines which version of a page is the master copy when similar or duplicate content exists at multiple URLs. It consolidates ranking signals onto one preferred URL.

What does this checker do?

It fetches a page, reads its canonical tag, and checks whether the canonical points to a valid, reachable URL that matches the page’s final address after redirects — catching mismatches that cause duplicate-content issues.

Why does a wrong canonical hurt SEO?

If your canonical points to the wrong URL, search engines may index or rank a different page than you intended, or drop the page entirely. Consistent, correct canonicals prevent split or lost ranking signals.

Should a page have a self-referencing canonical?

Yes, it is good practice. A canonical that points to the page’s own clean URL protects against duplicates created by tracking parameters, trailing slashes, or mixed http and https versions.