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Document Has a Valid rel=canonical

What This Audit Checks

This audit verifies that the page includes a valid <link rel="canonical"> tag pointing to the preferred URL for the content. It fails when the tag is missing, the URL is malformed, or it points to an unreachable page.

Why It Matters

Without a canonical URL, search engines may treat query-string variants, trailing-slash differences, or HTTP/HTTPS versions as separate pages. This splits ranking signals across duplicates and can result in the wrong version appearing in search results.

How to Fix It

  • Add a canonical tag to every page. Place it in the <head>, pointing to the preferred URL:

    <link rel="canonical" href="https://example.com/blog/my-post" />

  • Use absolute URLs. Always include the protocol and domain. Relative URLs are technically valid but error-prone.

  • Self-reference on unique pages. Even pages without duplicates should include a self-referencing canonical to protect against query-string variants like ?utm_source=....

  • In Next.js, use the metadata API:

    export const metadata = {
  alternates: {
    canonical: "https://example.com/blog/my-post",
  },
};

  • Ensure consistency. The canonical URL should match the URL you submit in your sitemap and the URL used in internal links. Conflicting signals confuse search engines.

How Pulse Tracks This

Pulse checks for the presence and validity of the rel=canonical tag on every audited page. Missing or broken canonicals are flagged in the SEO audit results so you can fix them before indexing is affected.

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