However, it should be noted that free duplicate checking tools usually have restrictions, such as frequency restrictions or daily restrictions. Therefore, if multiple or large files need to be checked repeatedly, you may need to consider using a paid duplicate checking tool or other solutions.
At present, there are many websites for duplicate checking of free papers on the market, including the first free paper, a certain number of free words and a free paper every day. The relatively safe and reliable free duplicate checking systems are paperYY, paperfree, and? Papertime, etc. To be on the safe side, it is recommended to use the duplicate checking system required by schools or academic journals!