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PaperCheck lets students run a real Turnitin AI writing detection and similarity check before submitting to their school. Upload a DOCX, PDF, TXT or RTF, and get an official report back in 5 to 15 minutes. Your paper is never added to any repository or plagiarism database, so checking here won't cause a self-match later. Files are deleted within 24 hours. Single checks start at $4.99, with volume packs available. PaperCheck is an independent service and is not affiliated with, endorsed by, or sponsored by Turnitin LLC.