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Inspect the canonical URL tag on any page. Detect missing canonicals, conflicting HTML and HTTP header canonicals, cross-domain canonicals, protocol mismatches, and duplicate tags that can confuse search engines.
Best for
Use this tool when you need one sharp answer fast before opening a broader report.
The input and results are designed to stay readable and tappable on smaller screens.
This page targets both broad keywords and practical queries people use before they audit a specific domain.
Frequently asked questions
Yes — the Canonical URL Checker is 100% free with no signup, no account, and no usage limits. Just enter a URL and get instant results.
Our Canonical URL Checker runs live checks against the target website in real time. Results reflect the current state of the site at the moment you run the check — not cached or historical data.
A canonical URL tells search engines which version of a page is the 'master' copy. Without it, Google may split ranking power across duplicate URLs (http/https, www/non-www, trailing slashes, URL parameters).
Yes — self-referencing canonical tags are a best practice. They confirm to search engines that this URL is the preferred version. Every indexable page should have a canonical tag, even if it's self-referencing.
Multiple conflicting canonical tags confuse search engines. Google may ignore them entirely and choose its own canonical, which may not be the URL you want ranking. Always use exactly one canonical tag per page.