SEO

Duplicate content

By Paul Brock·Updated on 22-04-2026
TL;DR

Duplicate content is identical or near-identical text reachable at multiple URLs, making it hard for search engines to determine which version to rank.

Duplicate content is rarely a penalty issue but almost always an efficiency issue: Google dilutes ranking signals across multiple URLs, picks its own canonical (not always the right one) and wastes crawl budget. Solutions vary: canonical for necessary duplicates, 301 for redundant variants, noindex for non-SEO-valuable paths.

Example

A shop sells the same shoe via four category paths. Without canonicals, backlinks and ranking signals split across four URLs. Fix: canonical to one primary.

Frequently asked questions

Is there a duplicate-content penalty?

Officially no since 2008. In practice signals dilute, so you don't get penalised but do rank worse than possible.

Related terms

Canonical tag301 redirectThin contentIndexingHreflangCrawl budgetTechnical SEONoindex

Further reading

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