Most universities and research institutes purchase site licenses. Ask your:
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iThenticate is a premium, paid plagiarism detection tool, there is no official "full gratis" version for individual users. However, you can often access its full features for free through specific professional or academic channels. How to Access iThenticate for Free Institutional Access : Most major universities and research institutions provide free access to iThenticate How to Access iThenticate for Free Institutional Access
There are free or lower-cost plagiarism detection tools available, such as Turnitin (for students), Quetext, or small-scale uses of Google Scholar for similarity checks. If so, how can I request an account
: If you are submitting a manuscript to a journal, some publishers provide a free similarity check
“Dear [Name], I’m preparing a manuscript for [Journal Name]. Does our university provide access to iThenticate for faculty/graduate students? If so, how can I request an account?”