Many university library systems or writing labs have dedicated, "no-repository" Turnitin accounts. Tutors can run your paper through the system to show you the similarity report without saving the file to the global database. If you need help finding alternative software, tell me: What subject or field is your paper about? Do you also need to check for AI-generated text ? What is your preferred citation style (APA, MLA, Chicago)?
To help you find the safest way to review your paper, let me know:
Websites or social media posts claiming to offer "free 2021 Turnitin keys" are often scams or outdated.
Numerous websites claim to provide working Turnitin credentials, but these claims are almost always false. As the MyHumanizer blog warns, "If you ever see websites or online posts claiming to offer 'free Turnitin class IDs' or 'public enrollment keys,' avoid them completely. Those are almost always shared without permission, and using them can get you locked out or even flagged by your school".