CopyScape

Copyscape is another popular online portal for researchers. 

Is your content original?

Articles that you purchase may have been copied or stolen from other sites. Publishing them on your site can damage your reputation and ruin your search engine rankings. Protect yourself by verifying all new content with Copyscape Premium, the web’s leading solution for originality checking.

Who’s stealing your content?

With the click of a button, anyone in the world can copy your content and republish it on their site, stealing your visitors and your revenue. Copysentry scans the web daily for copies of your content, emailing you whenever new copies are found.