rel=canonical: the ultimate guide

By Joost de Valk

A canonical URL lets you tell search engines that certain similar URLs are actually the same. Because sometimes you have products or content that can be found on multiple URLs — or even multiple websites. By using canonical URLs (HTML link tags with the attribute rel=canonical) you can have these on your site without harming your rankings. In this ultimate guide, I’ll discuss what canonical URLs are, when to use them, and how to prevent or fix a few common mistakes!

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