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SEO & Performance

Canonical URL Checker

Compare the URL of a page with the value of its rel="canonical" tag and flag common canonicalization problems. Everything runs in your browser — your URLs never leave the page.

Runs in your browser v1.0.0

Compare URLs

live

Paste the URL from the address bar and the href value of the page’s <link rel="canonical"> tag. Results update as you type.

Result

Page (normalized)
Canonical (normalized)
Suggested canonical URL

Findings

    How it works

    Both URLs are parsed with the browser’s own URL API and compared after canonicalization: scheme and host are lowercased, default ports are dropped, fragments are removed, and percent-encoding is normalized. The tool then inspects scheme, host, path, query parameters, and common SEO pitfalls such as tracking parameters, default ports, and trailing-slash mismatches. Nothing is ever sent to a server.

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