Validation

Canonical Tags Checker

Check if a page declares a clear, unique, and consistent canonical URL with the actual address you want to consolidate.

Analyze if the page has a defined canonical URL to avoid duplicate content issues.

The rel="canonical" tag tells search engines which is the official version of a page.

Enter a URL to start.

INFO

WHAT DOES THE CANONICAL CHECKER CHECK?

This tool analyzes the pasted HTML and identifies the canonical tag declared in the document.

Its goal is to detect missing canonicals, duplicates, relative URLs, or a canonical that does not match the expected URL.

Single canonical:
Detects whether there is a single valid canonical tag.
Absolute URL:
Flags relative or incomplete canonical URLs.
Self-referencing:
Compares the canonical with the expected URL when provided.
Basic duplication:
Warns if multiple canonicals exist in the same document.

Common questions about canonical URLs, consolidation, and duplicates.

Should the canonical always be self-referential?

For main pages, yes, that is usually recommended. In controlled duplicate scenarios, it can point to another equivalent URL.

Does a canonical prevent Google from crawling a URL?

No. The canonical is a consolidation signal, not a crawling instruction or an indexing directive.

Can there be multiple canonical tags?

There should not be. Multiple canonicals create ambiguity and may cause search engines to ignore the signal.