Duplicate Check is a php based program that you upload to your web site and run right through your web browser. You also have the option of select which file types you wish to examine (.txt, .htm, or .html) Most people who don't know that when a major search engine finds duplicate content on their web site, you get penalized. Getting penalized by these search engines means you drop in rankings, lose visitors and can even lose sales. What is duplicate content? Duplicate content can be two web pages on your web site with a certain percentage of the same content. You may have the same article or content page with different URL's such as support.html and newsupport.html having a 75% content match on both pages.