The Duplicate Content Checker analyses pages on your website for content similarity, identifying near-duplicate pages, thin content repetitions, and text blocks that appear across multiple URLs. It calculates similarity scores between page pairs, flags anything above a configurable threshold (typically 70%), and helps you identify which version should be the canonical URL so you can consolidate ranking signals on the right page.
Internal duplicate content is one of the most common and most overlooked SEO problems. It is not always caused by copying — most of the time it is structural. E-commerce sites generate duplicates through faceted navigation (colour/size filters creating separate URLs for the same product), CMS platforms create them through archive pages and tag pages, and content management workflows create them through staging or print versions. Google tries to deduplicate these automatically but often picks the wrong canonical — for example, indexing a filtered URL instead of the clean category page, or indexing a print version instead of the main article.
When Google chooses the wrong version, your links, crawl budget, and ranking signals accumulate on the wrong URL. The page you actually want to rank receives a fraction of the authority it should have. This checker makes the problem visible so you can correct it with canonical tags or 301 redirects.
