Virante’s free duplicate content checker is the most comprehensive web-based duplicate content tool available online. This tool checks 7 different common causes and effects of duplicate content to diagnose any current or potential duplicate content penalties.

Duplicate content issues can be some of the trickiest SEO problems to solve. However, correcting them can bring substantial rankings changes to your site without adding more content or link building. If you need help improving your rankings, fill out the form on the side of the page, and one of our client representatives will get in contact with you immediately!

This tool diagnoses common causes and effects of duplicate content penalties, and may take a few moments to load.

It tries to diagnose the common www vs non-www duplicate content issue by checking the headers returned by both versions of the url, the current cache in google, and possible PR dispersion.
It checks for the common default page error where both the / and /index.html (or other default page) return 200/OK headers.
It checks for incorrect 404 pages which deliver a 200/OK Header
It checks for supplemental pages in the Google index.

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