Canonical URLs12 rules onwhich address your pages name as the main one.
The canonical each page declares, the page it chooses, and addresses that serve the same page twice.
Canonical tags
- A page names more than one main addressA page's response carries more than one different canonical declaration.In the report: Multiple canonicals
- Paginated pages name page 1 as the main oneA page of a paginated listing declares page 1 as its canonical instead of itself.In the report: Paginated URLs declare page 1 as their canonical
- A page names a different page as the main oneA page names another page on the site as its canonical, and that page loads normally but does not name itself as canonical.In the report: Canonical mismatch
- A page names a page on another site as the main oneA page's canonical points to a host outside the site's own www and bare domain.In the report: Cross-domain canonical
Chosen pages
- The page named as the main one asks to stay out of searchThe address pages name as their canonical carries a noindex directive.In the report: Canonical target noindex
- The page named as the main one cannot be reachedThe address pages name as their canonical loops, runs past the redirect limit, returns a 4xx other than 429 or keeps returning a server error.In the report: Canonical target error
- The page named as the main one is blocked by robots.txtThe address pages name as their canonical is disallowed for Googlebot by robots.txt.In the report: Canonical target blocked by robots.txt
- A canonical points to a page that points elsewhereThe page a canonical names declares a different canonical of its own.In the report: Canonical chain
- A canonical target redirectsThe address named as canonical redirects before returning a final HTTP 200 response.In the report: Canonical target redirects
- Two pages name each other as the main oneTwo pages each declare the other as their canonical.In the report: Canonical loop
Duplicate addresses
- Both trailing-slash versions serve the same contentThe versions with and without a final path slash return the same recorded main content without supported consolidation.In the report: Both trailing-slash versions serve the same content
- Two case variants serve the same contentAn observed address and its lowercase path variant return the same recorded main content without supported consolidation.In the report: Two case variants serve the same content