Paste up to 500 words. You get a document score and a per-sentence highlight, so you know which paragraphs will be judged before anyone else judges them. Five checks a day free, two without an account.
The public detector runs a GPTZero-style scorer on our side. Final results on the humanizer are measured with GPTZero itself and shown with the model version.
AI text is smooth, so it is predictable. Swapping words, cutting sentences and fixing punctuation left the verdict unchanged. Eleven registers, eleven AI 100% results.
A human text close to your subject, most of its words kept, only what the subject forces changed. No sentence of your draft survives. No invisible characters, no deliberate typos.
Long documents are processed in 600–1,000-word sections and rejoined. Under 90 we swap the donor and run once more; still under, the credits come back.
