What is a canonical URL?

By the Variask team · Updated

Definition

A canonical URL is the preferred address of a page when the same content is available at several addresses. It is set with a link rel canonical tag, and helps search engines and AI systems treat duplicates as one page.

Also called rel canonical

How it works

  • Add a link rel canonical tag in the page head.
  • Point it to the main address of the content.
  • Use the same address in sitemaps and internal links.
  • Each page usually points its canonical to itself.

What it means for brands

  • Wrong canonicals can hide pages from search and AI.
  • Tracking links with parameters should point to the clean address.

Questions

Canonical URL:
common questions

It is good practice. A self referencing canonical makes the preferred address clear.

Yes, for syndicated content, but use it carefully.

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Full glossary