What Is a Canonical URL?

A canonical URL is the URL for the “main” version of a duplicated page, as determined by search engines like Google.

For example:

Canonical URL: https://example.com/blog/

Alternate URL: https://example.com/blog/?page=1

What Is a Canonical Tag?

Canonical tags, also known as canonical links or rel="canonical" tags, allow you to influence canonicalization. 

<link rel="canonical" href="https://example.com/preferred-url-here/" />

How to Implement Canonical Tags

To implement canonical tags in your HTML, you can add the rel="canonical" tag to the <head> section of the page. 

Other Ways to Specify Canonical URLs

1-Use rel=“canonical” in HTTP Headers

Use rel=“canonical” in HTTP Headers

A rel=“canonical” HTTP header allows you to specify a canonical URL for non-HTML documents.

2-Redirect Duplicate Pages to Canonical Pages

URL redirects send Google (and users) from one page to another. 

3-List Canonical URLs Only in Your Sitemap

“All pages listed in a sitemap are suggested as canonicals,” according to Google.

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