AI Detector

AI Detector is a free web tool that checks whether a piece of text was written by an AI model like ChatGPT or GPT-4. You paste your text and get a quick analysis showing which sentences look AI-generated. No account is needed, and it's completely free to use.

The tool runs entirely in your browser – your text never leaves your device. It uses pattern analysis to spot common markers of AI writing, such as overly uniform sentence structures or certain phrasing patterns. Results show a per-sentence breakdown, with each sentence flagged as likely human or AI-written. Alongside the text detector, the site also offers tools for detecting AI-generated images and PDFs, all with the same no-signup approach.

This tool is most useful for teachers checking student essays, editors verifying submissions, or anyone who wants a quick gut check on whether content is AI-generated. The developer claims 98% accuracy, but the tool itself warns results are for informational purposes and not definitive proof. It is simple, fast, and privacy-focused – a solid entry-level detector for everyday use.