Canonical URL
Checker
Enter your URL. Three URLs come into play: the one you type below, the final URL the site actually serves after any redirects, and the canonical URL the page declares. AISearch Global fetches the URL you enter, follows any redirects, and compares the resulting final URL against the declared canonical — a difference is something to review in context, not an automatic error.
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AISearch Global Canonical URL Checker · aisearch.global
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<link rel="canonical"> tag or your CMS's canonical URL field — an unintended mismatch can split ranking and citation signals across duplicate URLs.Need help deciding which findings matter?
Canonical URLs are one signal. Get a checked, prioritised DIY audit with AISearch Global's $1,500 Founder Audit — dated AI-search observations plus builder-specific fix instructions.
Built by AISearch Global · Sydney, Australia
About this tool
The AISearch Global Canonical URL Checker works with three URLs. First, the one you
type into the box: the address you're asking about. Second, the final URL: where that
address actually lands after this tool follows any redirects (www→non-www, http→https, a trailing
slash added, and so on). Third, the declared canonical: whatever the fetched page's
<link rel="canonical"> tag says is the authoritative version. The result compares the
second against the third.
A difference between them is something to review in context, not an automatic error. Redirects and canonicals can legitimately differ for reasons like www vs non-www, http vs https, a trailing slash, tracking parameters, or an intentional pagination canonical pointing a paginated page back to page one. An unintended mismatch, on the other hand, can split ranking and citation signals across what should be a single authoritative URL — that's the case worth fixing.
For metadata beyond canonical tags, see the Meta & Technical Checker.
Frequently asked questions
What does the Canonical URL Checker compare?
It compares the URL your browser actually reaches after following redirects against the canonical URL declared in the page's <link rel="canonical"> tag, and reports whether they match.
Why does a canonical mismatch matter?
A mismatch isn't automatically an error. Redirects and canonicals can legitimately differ for reasons like www vs non-www, http vs https, a trailing slash, tracking parameters, or an intentional pagination canonical. When the difference is unintended, though, search engines and AI systems can become unsure which version of a page is authoritative, which can split ranking signals and citation credit across duplicate URLs.
What are the three URLs this tool compares?
The URL you type in, the final URL the site serves after this tool follows any redirects, and the canonical URL declared in the page's <link rel="canonical"> tag. The result shown compares the final URL against the declared canonical.
What if no canonical tag is present at all?
Most CMSs default to treating the fetched URL as canonical when no tag is present, but explicitly declaring one removes any ambiguity, especially for pages reachable via multiple URL variants (with or without trailing slash, with tracking parameters, and so on).