Canonical Checker
Check canonical tag consistency and detect canonicalization issues.
Free for up to 50 checks per day. No signup required.
Canonical diagnostics
Use the Canonical Checker when the wrong URL may be selected for indexing
Canonical tags are hints that tell search engines which version of similar pages should be treated as the primary URL. They are helpful for duplicates, parameters, and syndicated content, but incorrect canonicals can make the URL you care about disappear from search.
This checker helps you confirm whether the page points to itself, points to another URL, or has no canonical at all. That context is especially important for ecommerce filters, migrated pages, translated URLs, and CMS-generated duplicates.
Recommended workflow
If the page should rank on its own, use a self-referencing canonical. If it is a duplicate, make sure the canonical target is live, indexable, and internally linked. Recheck both source and target URLs after changing templates.
What this check reviews
- Canonical URL found in the page source.
- Whether the canonical is self-referencing.
- HTTP status and redirect state of the submitted URL.
- Other blockers, such as noindex or robots.txt rules.
Canonical patterns to investigate
- A product or article page canonicalizes to the homepage.
- HTTP and HTTPS versions disagree about the preferred URL.
- Parameterized URLs create duplicate pages with inconsistent canonicals.
- A migration leaves old pages canonicalized to outdated URLs.