This should do the trick: http://www.smallseotools.com/plagiarism-... It's been around for several years now and keeps on improving.
Well, if want to check such serious works as research articles and dissertations u'd better not use free checkers because they are absolutely unreliable.
I recommend you to use only chargeable checkers, but read responses about them to be sure it's reliable and accurate.
I used a few free checkers, and can say that they are NOT reliable at all. As always, only the paid services are worth attention.
Copyscape.com is the best known for checking for web page content theft that could be adopted find copies of a document you paste into a blog.
http://plagiarism.com/ $250.00 program for teachers
I want to check my research articles and dissertations inside out, but I have no idea about a good, reliable plagiarism checking software available free on the internet, please help!
