Canonical Tag & Duplicate Content Inspector

The canonical tag (<link rel="canonical" href="...">) tells search engines which URL represents the authoritative master version of a page. Improperly configured canonical tags — such as pointing to 404 pages or redirect loops, conflicting HTML vs. HTTP headers, relative URLs, or missing HTTPS variants — dilute link equity and cause severe search engine indexing issues.

Enter any web page URL below to audit its canonical implementation across both HTML markup and HTTP response headers, verify destination response codes, and detect duplicate content risks. Audits self-referential vs cross-domain canonicals, header conflicts, and destination status health.