Specifically, the paper duplication checking system will first divide the paper into several small pieces, and then calculate the similarity between each small piece and the existing literature. If the similarity reaches a certain threshold, the system will think that there is duplication in this part. Common thresholds are 10% and 20%. If the paper repetition rate is below 10%, the system usually considers it as a paper with high originality; If the repetition rate is between 10% and 20%, the system will analyze the repeated parts one by one to determine whether there is plagiarism; If the repetition rate exceeds 20%, the system will judge that the paper is suspected of serious plagiarism and needs more rigorous review.
For the duplicate checking websites such as PaperFree, users need to upload their own papers first, and then follow the tips of the website, enter the name, paper title, school or unit name, upload the paper documents, and submit them for testing after paying the corresponding fees. Websites such as PaperFree also provide real-time online weight change, robot weight reduction, robot typesetting and other functions to help users quickly modify papers and improve their quality.