PaperRater is a web service that provides FREE online proofreading for your documents.

Besides that, with the combination of natural language processing (NLP), artificial intelligence (AI), machine learning, information retrieval (IR), computational linguistics, data mining, and advanced pattern matching (APM), PaperRater assists in checking your documents for grammar and spelling mistakes.

This is a sample report where PaperRater is able to detect if your document contains plagiarized texts.

To begin, simply copy and paste your paper into the given box and select the "Get Report" button to immediately receive an analysis of your paper. PaperRater will provide detailed stats about word choice, grammar, spelling, and more. PaperRater is also able to detect if your paper contains plagiarized text.

To conclude, PaperRater is definitely a great tool for students and writers. Give it a try!