Free tool
Canonical URL Checker
Check any URL's canonical tag. Detect missing, mismatched, or cross-domain canonicals that quietly kill your rankings.
Pro tips
Always self-reference
Unless the page is truly a duplicate, canonical should equal the page's own URL.
Full URLs only
https://www.example.com/page — protocol + host + path. No relative paths.
One canonical per page
Multiple canonical tags = Google ignores all of them.
Frequently asked questions
A <link rel="canonical"> in the <head> that tells Google which URL is the authoritative version of a page.
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