We have the following two URLs:

  1. https://example.com/%D1%82%D0%B5%D1%81%D1%82
  2. https://example.com/%d1%82%d0%b5%d1%81%d1%82

Both are identical except the the case (upper vs lower). Will Google consider them to be duplicate URLs or it does not matter?

  • 3
    The HTTP spec says that there are two case insensitive parts of URLs: the domain name and percent encoding. If Google is following the spec, it shouldn't treat them as different URLs, however, I don't have any experience or evidence that they do things correctly. Sep 14, 2017 at 10:25
  • Not that it answers your question per se, but a solution would be to ensure that your canonicals reference the "decoded" version of the URL. If you have <link rel="canonical" href="https://example.com/тест"> then it's not only clear to search engines which version to index, it's clear to human visitors/searchers what you're actually serving. Oct 20, 2017 at 17:04
  • See also: Does URL encoding create duplicate content? which isn't about the case sensitivity, but about characters that can optionally be encoded. Oct 20, 2017 at 19:48


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