Duplicate Content
Overview
Duplicate content occurs when multiple URLs present identical or substantially similar content. Search engines attempt to determine a canonical version of duplicate pages, but conflicting signals can prevent proper indexing and dilute ranking signals.
Common Causes
- multiple URLs generated by CMS parameters
- accessible pages through both HTTP and HTTPS protocols
- duplicate pages created by category or tag archives
- pagination creating repeated content across URLs
- lack of canonical tags specifying the preferred page
How the Problem Appears
- multiple URLs indexed for the same content
- search engines choosing incorrect canonical pages
- ranking signals divided across duplicate URLs
- crawl reports identifying duplicate titles or descriptions
How It Is Diagnosed
- crawling the site to detect identical page content
- inspecting canonical tags in HTML source
- checking indexed pages using site search operators
- reviewing crawl reports highlighting duplicate pages
Typical Fix
- implement canonical tags identifying the primary URL
- redirect duplicate URLs to the preferred version
- restrict indexing of parameterized URLs
- consolidate duplicate content into a single page