Generate a canonical link tag from a URL, and get flagged on common issues like using http instead of https or an inconsistent trailing slash.
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A canonical tag (<link rel="canonical" href="...">) tells search engines which URL is the 'master' version of a page when the same or similar content is reachable through multiple URLs, like with and without a trailing slash, with tracking parameters, or through http vs https. This consolidates ranking signals onto one URL instead of splitting them across duplicates.
Pointing the canonical to an http:// URL when your site actually serves https:// (or vice versa), including tracking query parameters in the canonical URL, and inconsistent trailing slashes are all common mistakes that undermine what a canonical tag is meant to fix. This tool flags each of these automatically.
It's widely considered good practice for every indexable page to have a self-referencing canonical tag (pointing to itself), even when there's no known duplicate, as a safeguard against unexpected duplicate URLs appearing later.
Yes, cross-domain canonicals are valid and used when the same content is intentionally published on multiple domains, pointing all copies to a single preferred domain.
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