AI Content Detector - Copyleaks

Verify what content was written by a human or an AI chatbot with the AI Content Detector browser extension from Copyleaks.

Find out what's human-made as you browse. The award-winning Copyleaks AI Detector checks text and images for AI right where you're reading: highlight text or hover an image, and the side panel shows whether AI was detected and where. Paid plans also check text for plagiarism. Check articles before you cite them, reviews before you buy, and your own writing before you submit. Get started 1. Add the extension and pin Copyleaks to your toolbar. 2. Sign in with Google, Apple or email. 3. Highlight text or hover an image, press the Copyleaks button, then press Scan. Detect AI-generated text Highlight or paste text, then press Scan to see how much of it was written by AI tools like ChatGPT, Gemini and Claude. Check for plagiarism (paid plans) See how much of the text matches other sources, and which ones. Detect AI-generated images Hover an image or drop it into the side panel, then press Scan to see if it was made with AI. Copyleaks checks the image down to the pixel, and a heatmap shows exactly which areas look AI-made. Free and paid: • Free: a daily allowance of AI text and image scans. • Paid plans add plagiarism detection, scan history in the extension, and one click to the full report in Copyleaks. Paid scans use your plan's credits. Why Copyleaks • The same award-winning AI detection trusted by hundreds of schools, universities, publishers, and businesses worldwide. • Over 99% accuracy and a 0.2% false positive rate, based on internal testing of English-language datasets. • More than a decade of training data, from trillions of scanned documents. • Cited as the most accurate AI detector at scale in multiple academic studies. • Built to avoid false accusations, and tested for fairness across non-native and neurodivergent writers. • Detects AI in multiple languages. Good to know • Text scans need 350 to 25,000 characters. • Images need to be at least 512 × 512 px, as PNG, JPEG, BMP, WebP or HEIC/HEIF. • Use results to guide your own review, not as a final judgment. • Need help? Use the Help center icon in the side panel. Frequently asked questions • Is the Copyleaks extension free? Yes, with a daily limit. A free Copyleaks account gets 5 AI text scans and 3 AI image scans a day. Plagiarism detection, scan history and the full report need a paid plan. • Can it detect AI-generated images? Yes. The Copyleaks extension checks images for AI: hover an image or drop one into the side panel to see "AI detected" or "No AI detected", with a heatmap of the areas behind the result. • Does it check for plagiarism? Yes, on paid plans. The Copyleaks extension shows how much of the text matches other sources, split into exact match, minor changes and paraphrased, with the top 3 matching sources. • Which AI tools does it detect? The Copyleaks extension detects text written by AI tools such as ChatGPT, Gemini and Claude. • Can I see my past scans? On paid plans, yes. The Copyleaks extension adds every scan to your history, and each one opens as a full report in Copyleaks. Free scans aren't added to history and can't be reopened, including after you upgrade. • Which browsers does it work in? The Copyleaks extension works in Chrome and Microsoft Edge on desktop. • Is this the old extension with a new look? No. The Copyleaks extension was fully redesigned. It adds AI image detection, and plagiarism detection on paid plans, which the old version didn't have.