PlagTracker is a service online that uses a checking algorithm to scan content for plagiarism. It is fast and easy to use and when it detects plagiarism, it provides also a list of all the sources, to make it easier for the user. The system does not save uploaded contents. A single document can be checked an unlimited number of times. The limit of words for a document to be checked for free is 5000. To exceed it, it is possible to subscribe for the premium version.