Audit rel=canonical tags on single pages or bulk URLs. Detect missing, duplicate, and conflicting canonical tags. No uploads, 100% private.
Checking your rel=canonical tags is essential for a healthy technical SEO setup. Our free Canonical Tag Checker lets you verify that every page points to the correct canonical URL in seconds:
Unlike other canonical checkers that send your pages to their servers, this tool works entirely in your browser. Your HTML, headers, and URLs never leave your device. There are no limits on how many pages you audit, no sign-ups, and no data collection.
A canonical tag checker is a tool that audits the rel=canonical tag on a webpage to verify it points to the correct canonical URL. It helps SEOs detect duplicate content, missing canonicals, and misconfigured tags that can split link equity.
The canonical tag tells search engines which version of a URL is the preferred one when duplicate content exists. Without a correct canonical, search engines may index the wrong URL, dilute ranking signals, and cause duplicate content issues.
No, the Canonical Tag Checker runs entirely in your browser. Paste raw HTML or a URL and the audit happens locally. Your pages, headers, and data never leave your device.
Yes, the tool includes a bulk audit mode where you can paste multiple URLs or HTML blocks and check all their canonical tags at once, then export the results as CSV.
The checker detects missing canonical tags, self-referencing vs cross-referencing canonicals, conflicting or multiple canonical tags, lowercasing and trailing slash mismatches, HTTP vs HTTPS canonical mismatches, and non-indexable canonical targets.
Free Tools