Different schools or institutions have different regulations on the number of duplicate checks, and students are generally allowed to make one or more duplicate checks before submitting their papers to avoid academic misconduct. Most schools and institutions will provide at least one free duplicate check opportunity. You can check your paper before submitting it to ensure its originality and academic integrity.

In addition, some commercial duplicate checking websites can also provide duplicate checking services for many times, but they need to pay a certain fee.

Whether it is a school or a commercial duplicate checking website, it only provides duplicate checking service and cannot replace academic integrity and originality requirements. Students or members should pay attention to academic integrity and originality when writing papers, and abide by academic norms and laws and regulations.