First of all, we should choose well-known duplicate checking software to use. Security can only be guaranteed by entering the official website entrance of the duplicate checking software, and official website is the most reliable. If the other party doesn't even have official website, especially some merchants on Taobao and Pinduoduo, even if they promise to provide free duplicate checking service, we are not sure whether it is genuine or not. We must pay attention and try not to go.

Secondly, you can use the official WeChat account of the duplicate checking software. This is also more reliable. But the premise is to find professional, safe and well-known duplicate checking software. Other duplicate checking software may be free, but the duplicate checking effect is not good, so is the duplicate checking in schools, and the security of the paper is not guaranteed.

Finally, I suggest you choose paid duplicate checking software, which is safe and efficient.