Published
Canonical tag checker
Paste your page head to find missing, repeated or conflicting canonical tags. Your input stays in this browser tab; it is not sent to our server or saved by this tool.
What to do with the result
A canonical nominates a preferred version of duplicate content. Google can choose another URL. Use an absolute target in the HTML head and avoid conflicting declarations. A different-origin target deserves review but is not inherently invalid.
This is a check of your pasted markup, not a crawl or an index check. Confirm the original placement and inspect the indexed URL in Search Console to see what Google chose.
Google: canonical implementation guidance
Canonical or redirect? Use the duplicate-content decision table