Dupli Checker is one of the most effective free plagiarism detection tools on the Internet. While it doesn’t have a fancy interface, it certainly gets the job done well. You don’t have to pay anything. Whether you are a one-time user or plan to make the most of this free plagiarism detection tool on a daily basis, you are not required to pay for subscription. You are presented with a very basic, functional layout that does not require for any previous experience with plagiarism detection tools. Duplichecker enables you to either copy and paste your text in the field and then check it for plagiarisms, or upload a Docx or Text file from your computer. If you sign up for free, Duplichecker allows you to do 50 plagiarism checks in a single day. If you choose not to indulge in a free sign-up then you are limited to only 1 plagiarism check per day. Registration not required.