What is Duplicate Content?
TL;DR
Identical or very similar content appearing at multiple URLs. This confuses search engines about which version to rank. Common causes include www vs. non-www, HTTP vs. HTTPS, URL parameters, and printer-friendly pages. Fix with Canonical Tags, 301 Redirects, or Noindex on duplicate versions. Rarely results in penalties but does waste Crawl Budget.
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Frequently Asked Questions About Duplicate Content
Does duplicate content cause a Google penalty?
True penalties for duplicate content are rare and reserved for deliberate manipulation. However, duplicate content dilutes ranking signals, Google chooses one version and the other may not rank at all. It's a ranking problem, not usually a penalty.
What causes duplicate content?
Technical issues: www vs non-www, HTTP vs HTTPS, trailing slashes, URL parameters, session IDs, print-friendly pages, and mobile URLs. Also: pagination, product variations, and syndicated content copied from elsewhere.
How do I fix duplicate content?
Use canonical tags to designate the preferred version. Set up 301 redirects for URL variations (www, HTTPS). Handle parameters in Search Console. Noindex pages that shouldn't rank. For syndicated content, get the original source to canonical back to you.
Terms Related to Duplicate Content
Canonical Tag
An HTML element that tells search engines which version of a page is the "main" one. If you have similar content accessi...
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Read definition SEO301 Redirect
A permanent redirect that tells browsers and search engines "this page has moved forever, go here instead." When someone...
Read definition SEO302 Redirect
A temporary redirect that tells search engines "this page has moved for now, but it's coming back." Unlike a 301 Redirec...
Read definition SEOAlgorithm
The complex set of rules Google uses to rank websites. Google updates its algorithm thousands of times per year, with ma...
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