Canonical URL

The SEO term “canonical URL” refers to the specific URL that a webmaster designates as the primary or “canonical” version of a webpage.

This is done using the canonical tag, which helps search engines understand which version of a page should be indexed and ranked, especially when there are multiple versions of the same content available.

Importance in SEO

A canonical URL is important because it helps prevent duplicate content issues, which can lead to lower search engine rankings or even penalties.

By specifying a canonical URL, webmasters can ensure that search engines attribute the value of the content to the correct page, improving the accuracy of indexing and ranking.


If a website has both “” and “” (with a trailing slash), search engines might treat these as two different pages.

However, if the webmaster sets “” as the canonical URL, search engines will understand that this is the primary version of the page, and the other version will typically be ignored in search results.


  • Use a canonical URL to consolidate link equity and search engine rankings when there are multiple, similar versions of a page (e.g., with and without a trailing slash, www, and non-www versions).
  • Update the canonical URL if your website’s structure changes to ensure it always points to the most relevant page.
  • Use the rel=”canonical” tag in the head of your HTML to indicate the canonical URL for each page.


  • Overuse or abuse the canonical URL by applying it to pages that do not have duplicate content issues.
  • Forget to update the canonical URL when making significant changes to your website’s structure or content.
  • Use the canonical URL as a substitute for creating unique and valuable content on each page of your website.