Plagiarism is a very despicable act in the academic world that requires an active effort from Universities to prevent and to identify it at an early stage in order to maintain the reputation of the university. One easy way to quickly identify plagiarism is by the university proactively conducting a deep examination of papers written by members of their academic community before it is published. Nowadays, there are several anti-plagiarism software that can assist to quickly conduct these plagiarism examinations. However, because of these many choices of antiplagiarism software, even freely available software, sometime it is hard to choose the most suitable software to use. This paper report on the result from a study that compare several freely available anti-plagiarism software with the hope it can help universities on deciding which one to use. This study chose the top six highest ranked software that were produced from several search engine with the keyword "free anti plagiarism software", whichare: Plagiarisma.Net, Viper, The Plagiarism Checker, Dupli Checker, Plag Tracker and Small Seo Tools Plagiarism Checker. The study employed several important parameters in comparing these anti-plagiarism software, which are: accuracy, validation time, the diversity of format text, number of characters/words, ease of use, report, and security. Results from the study indicate that there is no one anti-plagiarism software that can meet all user needs, thus there is no one superior software for all categories but there are software that are superior for certain categories.