Red Paper — Plagiarism & AI Checker

Check documents for plagiarism and AI-generated content without leaving your browser.

Red Paper checks your documents for plagiarism and AI-generated content right from your browser toolbar. Upload a PDF, Word document (DOC/DOCX), RTF or TXT file, see the exact cost before anything is charged, and start the scan using the credits in your Red Paper account. While the scan runs you can close the popup: the extension checks back in the background and notifies you as soon as the report is ready. WHAT YOU GET • Similarity score from our plagiarism-detection engine, compared against web pages, academic publications and journals • AI-content score showing how much of the text looks machine-generated • Downloadable PDF reports: the full similarity report, the AI report and a certificate • Your full report history, the same list you see under My Reports on the website • A desktop notification when a scan finishes HOW IT WORKS 1. Sign in with your Red Paper account (checkplagiarism.ai). 2. Choose a file. You see the price before you confirm. 3. Start the scan from your credits. 4. Download the reports when they are ready. Scans started from the extension appear on the website and in the mobile app as well, because it is the same account. You need a Red Paper account with credits. Credits are bought on the website at checkplagiarism.ai. The extension does not take payments itself. PRIVACY Documents are sent only to Red Paper's own servers over HTTPS and are handled under our privacy policy. We do not sell or reuse your content. The extension stores only your sign-in key and the IDs of scans in progress on your device, and both are removed when you sign out. Support: support@checkplagiarism.ai