Paperfree official website has reliable duplicate checking, and adopts a high-security server certified by Alibaba Cloud to fully protect users' privacy. When using paperfree to check the copy, the user will log in to his account. After the test is completed, the user downloads the test report by himself.

Paperfree will not include and add any files submitted by users to the comparative database unless users publish their papers in journals that can be included. The excellent graduation thesis collected by the system is generally submitted to the library by the tutor, and then submitted to the duplicate checking system by the library.

Many users said that paperfree's duplicate checking results were accurate and reliable, users could check the first draft for free, and they could find duplicates that they didn't notice. Some users even compared paperfree with other well-known paid duplicate checking tools and found that the results of paperfree were quite satisfactory.

It should be noted that any duplicate checking tool cannot guarantee the accuracy of the result 100%, because duplicate checking itself is a complex and subjective process.