A free version of TurnItIn plagiarism check is available at TurnItIn.com as a trial, as of 2015. TurnItIn compares written work to a large academic database and highlights both plagiarism and citation errors. TurnItin's academic database contains over 45 billion web pages and 130 million academic publications.
TurnItIn offers a similarity percentage for each source used, highlighting potential plagiarism between a written text and the sourced content. TurnItIn offers custom filters and settings such as exclude quotes, exclude bibliography and an option to hide low similarity percentages. TurnItIn also offers online assignment uploading capabilities for students and teachers, through GoogleDrive or Dropbox. The program is web-based and available for users 24 hours a day, 7 days a week.