The plagiarism checker is deactivated by default. To activate it, open or create a document in the Grammarly Editor and click Check for AI text & plagiarism in the upper-right corner:
Note: If your Grammarly account is provided by your school and you do not see the Check for AI text & plagiarism option, it means your institution has opted out of using Grammarly’s plagiarism and AI text checker. This may be because your school uses another service for plagiarism checking.
If you know the plagiarism checker is supposed to be there, but you still don’t see it, you might have accidentally created and logged in to a Grammarly Free account. Please make sure to log in to your paid account to access the plagiarism checker.