Canonicalization is a method used to help prevent duplicate content issues and manage the indexing of URLs in search engines. Implementing the canonical tag link attribute “rel=canonical” is a signal to search engines about the preferred page for indexing, and will be abided to in most cases when it is correctly implemented to an equivalent page. Our Hangout Notes on canonicalization provide best practice advice and insights for how it is handled by search engines.

AMP Pages Need to Have Canonical Tags

February 20, 2018 Source

AMP pages without a canonical tag run the risk of not being considered to be valid, as well as creating duplicate content issues.

Canonicalising to Redirects Can Increase Time Taken to Index Preferred Version

January 23, 2018 Source

Canonicalising to redirects can increase the time taken for Google to decide which version to index, especially if these pages aren’t identical. Google also looks at other signals such as internal linking and sitemap files to make this decision.

You Can See Which Canonical Google Has Chosen in the New Search Console

January 9, 2018 Source

In the new Search Console you can select individual URLs which takes you to the info query showing you the canonical that Google has chosen.

Canonicals Are Chosen by Google Using XML Sitemap URLs

January 9, 2018 Source

XML sitemap URLs are used to help inform Google’s decision on which URL is chosen to be the canonical.

Canonicalization For Filter Results Pages Isn’t Recommended

January 9, 2018 Source

Canonicalization shouldn’t be used for filter pages. This is because canonical tags can be ignored and filter pages aren’t always the same as they have different types of results.

Incorrect Google Caching Suggests a Different Canonical Has Been Chosen

January 9, 2018 Source

If the cached content from a different page is displayed on a page, this could be because Google has determined that the two pages are duplicates and has canonicalised one to the other.

Mobile Pages Must be Canonicalised to their Desktop Equivalents

November 14, 2017 Source

If the desktop and mobile versions of a page both appear it means that Google doesn’t understand the connection between them. Make sure the mobile page has a canonical tag to the desktop page.

Rel Canonical Isn’t Required For Paginated Pages

November 3, 2017 Source

If pagination is added to a page with rel next and rel previous it isn�۪t necessary to add a rel canonical to the page itself but it’s good practice.

Content on Canonicalised Paginated Pages Will Be Lost

October 6, 2017 Source

Unique content and links on canonicalised paginated pages will be lost if Google accepts the canonical directive.

Related Topics

Crawling Indexing Crawl Budget Crawl Errors Crawl Rate Disallow Sitemaps Last Modified Nofollow Noindex RSS Fetch and Render