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Google Search Console may report pages as duplicates when it finds multiple URLs with the same content.

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What Are Canonical URLs?

A canonical URL tells Google which version of a page is the “official” one. Without this, Google may see duplicates:
  • https://example.com/about
  • https://example.com/about/
  • https://www.example.com/about
  • https://example.com/about?ref=twitter

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Common Causes

IssueExample
www vs non-wwwexample.com and www.example.com both work
Trailing slashes/about and /about/ both work
Query parameters/page and /page?utm_source=x
HTTP vs HTTPSBoth protocols accessible

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How to Fix

1. Add canonical tags to every page: 
<link rel="canonical" href="https://yourdomain.com/about" />
In React with Helmet: 
<Helmet>
  <link rel="canonical" href={`https://yourdomain.com${location.pathname}`} />
</Helmet>
2. Set up redirects for duplicates: Choose one canonical format and redirect others:
  • Pick either www or non-www (non-www is simpler)
  • Pick either trailing slash or no trailing slash
  • Redirect HTTP to HTTPS
3. Be consistent with internal links: Always link to the canonical version of URLs in your navigation and content.
All Hado SEO plans include routing rules with redirect support. Starter plans include up to 5 rules; all other plans include unlimited rules. Configure these in your Routing Rules to automatically redirect duplicates.