ChatGPT Detector: free online tool
ChatGPT Detector estimates how likely a text is to be AI-generated and shows which sentences look most machine-written. It combines writing-style statistics with a small neural classifier that runs in your browser.
Also searched as: chatgpt detector · detect chatgpt text · was this written by ai · gpt-4 detector · claude detector · gemini text detector
How to use ChatGPT Detector
- Paste your text or upload a PDF.
- Run the check.
- Review the overall score and the highlighted sentences.
What you can do
- Sentence-level heatmap
- Works on essays, articles, emails and reports
- Optional Advanced AI ensemble for higher accuracy
Runs 100% in your browser · No upload · No sign-up · No limits
Privacy and where your file is processed
In browser mode the text never leaves your device. Advanced AI mode runs on our own GPU server and deletes the text after processing.
Free usage limits
Free to use. In your browser: no account, no file-size limit and no usage limit. Advanced AI mode (our private GPU server): free account with 150 credits a month (1 credit per page for OCR and PDF to Word), files up to 50 MB and 100 pages. There is no paid tier.
Frequently asked questions
Can it prove a text was written by ChatGPT?
No detector can. The score is a probability; use it to decide where to look closer, not as evidence on its own.
Does it detect Claude and Gemini too?
It looks for patterns shared by modern chatbots rather than one specific model, so it reacts to Claude, Gemini and similar tools as well.