Turnitin offers Similarity Check on uploaded documents for proper citation or identifying potential plagiarism. Once a paper is submitted to Turnitin database, it will compare with documents in the continuously updated database consisting of current and archived web pages, millions of student papers worldwide, and so on. For student, please check this Online Guide to access this service.
Are you looking for a tool to prior check the similarity for theses?
Try Turnitin Draft Coach, which is a learning tool to perform prior checking on documents created using Microsoft Word Online. It includes three functions:
Other than showing the percentage of the similarity score in documents, it provides writing suggestions from an academic view and citation guidelines in real time.
Start to use it in your writing and check this Online Guide for its functions and installation.