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Canonical URLs tell search engines which version of a page is the “official” one. When multiple URLs serve the same or similar content, the canonical tag helps consolidate ranking signals and prevent duplicate content issues. SERP Lens detects canonical URLs through the Indexing panel in the browser sidebar.

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What SERP Lens checks

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Self-referencing canonicals

The canonical URL points to the page itself. This is the most common setup and confirms to search engines that this URL is the preferred version.

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Cross-page canonicals

The canonical URL points to a different page. This tells search engines to treat the other page as the primary version and consolidate ranking signals there.

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Missing canonicals

No canonical tag is present. While not technically an error (search engines will infer the canonical), it’s best practice to always declare one explicitly.

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Common issues

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Checking canonicals in SERP Lens

  1. Navigate to the page you want to check
  2. Open the sidebar and go to the Indexing panel
  3. The Canonical URL section shows the declared canonical, whether it’s self-referencing or different, and flags any mismatches

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Next steps

Indexing panel

Full indexing analysis including robots, hreflang, and sitemaps.

Redirect tracing

Trace redirect chains that may affect canonical resolution.