AI text detector

Standard (Sapling) scores the whole text and each sentence, and is the cheapest option for English. Detailed (Pangram) separates AI-written from AI-assisted passages and flags text that was run through humanizer tools.

Text a person wrote and then had an AI tool edit or polish, as opposed to text an AI wrote outright. Only the Detailed detector makes this distinction.

Yes. Upload a TXT, Markdown, CSV, PDF or DOCX file. The text is extracted in your browser and placed in the text box before anything is sent.

It’s sent to the detector you pick (Sapling for Standard, Pangram for Detailed) to run the check. NanoGPT doesn’t store it. Your recent checks are saved only in this browser. Each provider handles what you send under its own privacy policy.