Google uses these signals for canonicalization

Google’s John Mueller said on Twitter that Google uses many different signals for canonicalization: redirects, internal ande external links, sitemaps, hreflang, canonicals, cleaner URLs, and other signals.

If the same page is available at different URLs, Google tries to find the standard version of the page. That standard version is the canonicalized URL.

Check redirects and more on your website

The website audit tool in SEOprofiler checks redirects and many other things on your website. Ensure that your web pages are error-free:

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Johannes Selbach

Johannes Selbach is the CEO of SEOprofiler. He blogs about search engine optimization and website marketing topics at "http://blog.seoprofiler.com".