Abstract: The present invention provides a method for detecting plagiarism in Arabic texts including any rewording, reordering of words and phrases, and any pronoun changes. Such detection is achieved by returning all the Arabic words in the text to its original root using a stemmer, then comparing all the sentences in the submitted document with every sentence in all original documents. In the method of the present invention, the user has the ability to choose the source of plagiarism, wherein such source comprises a database, a web, or a direct matching.