This website uses URLs with www and non-www subdomain. This may cause duplicate content and bad link

Technical Q&A
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Topic summary

A webshop owner received an SEO warning that their site is accessible via both www and non-www URLs (e.g., www.snorkly.nl and snorkly.nl), which can create duplicate content issues and harm search rankings.

Recommended Solution:

  • Choose one preferred domain version (either www or non-www)
  • Update all internal links to use the chosen version consistently
  • Implement a 301 redirect to automatically send all traffic from the non-preferred version to the preferred one

Implementation Options:

  • Configure redirects through Shopify settings
  • Work with hosting provider for server-level configuration
  • Review domain setup documentation to ensure proper configuration

The issue remains unresolved as the original poster has not confirmed which solution they pursued or whether the problem was fixed.

Summarized with AI on October 28. AI used: claude-sonnet-4-5-20250929.
1

Im trying to optimize my webshop Snorkly.nl for SEO, but when i checked one of my pages with an online site check it gives me this error ''This website uses URLs with www and non-www subdomain. This may cause duplicate content and bad links to your website. Redirect Checker ‘’ the page i checked was https://www.snorkly.nl/products/full-face-snorkelmasker-2 does anyone know what this means and how i can fix this.

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2

Yes i want to look into how this can be resolved

3

Hi @Jurgen2320 . First, you can choose your preferred domain (e.g., www.snorkly.nl or snorkly.nl) and ensure all internal links on your site consistently use that version, then set up a 301 redirect in your Shopify settings or server configuration to permanently redirect all traffic from one version (e.g. the non-www) to the other (e.g. the www).

Otherwise, please consult your hosting provider for specific steps to implement the redirect. Cheers!

4

Hi @Jurgen2320

If you encounter this issue about store URLs, this means your domain setup is incorrect.

You can check this article to set up your domain properly. Thank you!

https://support.google.com/blogger/answer/1233387?hl=en&ref_topic=6321959