While the text-matching tool, Turnitin®, has traditionally been used to deter and detect plagiarism, more recently, instructors have started to use this tool for formative self-assessment. To describe Turnitin®'s use in practice and to explore perceptions of this tool, we surveyed 940 students, teaching assistants, and instructors at a Canadian university. Our findings indicate that Turnitin® was more commonly used for plagiarism detection than for formative self-assessment. The majority of respondents had positive views of Turnitin®, and 70% of students stated that they had no concerns about using this tool. Despite these positive findings, content analysis of open-ended responses indicate that students experience increased anxiety of being falsely accused of plagiarism and have concerns about their work being stored in the Turnitin® database. Our findings lead us to conclude that there is a need for more information and improved communication about Turnitin® for all three groups.