Duplicate content is substantively similar or identical content that appears on multiple URLs, either within the same website (internal duplicates) or across different websites (external duplicates). Search engines must decide which version to index and rank.
Why Duplicate Content matters for SEO
Duplicate content splits ranking signals between multiple URLs, causing keyword cannibalization. Google won't penalize you for duplicate content, but it will choose which version to index, and it may not choose the one you prefer. Common causes: parameter URLs, trailing slash variations, HTTP/HTTPS versions, and print-friendly pages.
Pro tip on Duplicate Content
Use canonical tags to point all duplicate versions to the preferred URL. Implement 301 redirects for permanent URL consolidation. Use parameter handling in Google Search Console. For ecommerce, canonicalize product variant pages to the main product URL.
Related terms
Duplicate content silently splits your ranking signals. CrawlRaven identifies every duplicate across your site and recommends whether to canonicalize, redirect, or noindex.
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