Plagiarism checkers are a student's enemy. They do not need to have their report checked for plagiarism. They need professors to do the job they are paid to do which is to teach, assign homework or research papers, review the work, and grade it accordingly. These plagiarism checkers do not help at all. When these checkers were just starting out, these were detecting the word "the, and, an, I," as plagiarized words. The software has improved very little since then. No plagiarism checker is foolproof. No plagiarism checker does the job 100 % correctly. It is a waste of time to willingly submit your paper to these servers, whose owners may do anything that they wish with your paper once you have freely given them to rights to it by having it checked for plagiarism.