Prevent duplicate URL signals
Canonical tags help search engines understand which version of a page should be treated as the preferred URL.
Canonical URL Checker
Compare page URLs with canonical URLs.
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Check whether a canonical URL is valid, self-referencing and on the same origin as the page URL.
- URL validity
- Self-canonical check
- Same-origin check
- Canonical output
Check migration details
During redesigns, platform moves and URL cleanup projects, compare old and new canonical patterns before publishing.
Catch cross-domain mistakes
A canonical pointing at another origin can be intentional, but accidental cross-domain canonicals can suppress important pages.
Review query and fragment handling
The checker highlights path, query string, absolute URL and fragment differences that are easy to miss in manual reviews.
Frequently asked questions
It compares a page URL and canonical URL for validity, same-origin status, exact self-canonical matching, path and query consistency, absolute URL format and fragments.
Yes. Absolute HTTP or HTTPS canonical URLs are easier for crawlers to interpret consistently than relative canonical paths.
No. Cross-domain canonicals can be intentional for syndicated or duplicate content, but they should be reviewed carefully because they can consolidate signals away from the current page.
No. This browser-based checker compares the URLs you enter. Use it for quick validation while reviewing markup, templates or migration spreadsheets.