There is a big difference between PDF duplicate checking and word duplicate checking. Duplicate checking, as its name implies, is to compare one's own papers with the major discussion libraries through the comparison of the paper detection system resource libraries. In short, it is to test the plagiarism rate and see if your paper is original. For example, endnotes and footnotes are generally undetectable by HowNet in Word, but in PDF, HowNet will treat them as text detection.

PDF format has strong confidentiality. If the contents in the PDF document are not correctly identified during duplicate checking and parsing, garbled codes will appear, resulting in a result of 0, and the detection rate of PDF is relatively high. The table of contents in WORD documents is automatically generated, which is also beneficial to duplicate checking of papers. HowNet duplicate checking system will detect based on the division of chapters in the catalogue, so that the final detection results are also displayed in chapters, which makes students look more intuitive and clear. The advantage of this is that the tutor can be more targeted when guiding and revising the students' papers. However, if the submitted papers are uploaded in PDF format, it is impossible to achieve this effect, and it is likely to be replaced by a bunch of garbled codes. Therefore, it is recommended that you convert PDF documents into Word before checking for duplicates.