http://www.plagiarismchecker.com/
PlagiarismChecker.com allows you to search for several phrases from a
student's paper at the same time without having to type quotation marks
or special operators, which most search engines require if you're trying
to look for exact copies of a student's writing. This site
automatically adds the quotation marks and special operators for you.
Other plagiarism detection services are available, but some only work if
you buy subscriptions. Most of these services also require students to
turn their papers in through a Web site, which is difficult for
students who do not have access to the Internet. PlagiarismChecker.com
is free and works on any papers, whether students e-mail them to you or
turn in hard copies.
