Assess canonical tag coverage and the duplicate content risk that remains.
Every indexable page should carry a self-referencing canonical as a baseline. Conflicting signals are worse than missing ones, because search engines may disregard canonicalisation for the whole site. Parameter URLs are the most common source of duplication, and canonical tags are the standard remedy where blocking is not appropriate.
Canonical URL Checker
Coverage = URLs with a canonical tag ÷ total indexable URLs
Coverage = URLs with a canonical tag ÷ total indexable URLs Every indexable page should carry a self-referencing canonical as a baseline. Conflicting signals are worse than missing ones, because search engines may disregard canonicalisation for the whole site.
Parameter URLs are the most common source of duplication, and canonical tags are the standard remedy where blocking is not appropriate.
This calculator takes 5 inputs: Total indexable URLs, URLs with a canonical tag, Self-referencing canonicals, Conflicting or incorrect canonicals, Parameter or duplicate variants. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.