AI writing detector that flags machine-generated text and checks provenance
GPTZero is an AI detection service used mainly by teachers, editors and admissions staff. You paste or upload text and it returns a probability that the text was machine generated, with sentence-level highlighting showing which parts drove the verdict, plus a scan that looks for signs a document was pasted out of an AI chat interface. Plagiarism checks and writing-feedback tools round out the education-oriented feature set. Detection is genuinely uncertain work: false positives occur on formal or heavily edited human prose, so the right way to use a score is as one signal among several rather than as proof of anything.
Last updated: 2026-09-20. This site only provides an index; for exact features, pricing, and licensing, see the official website.
academic integrity checks, editorial screening and ai-content research
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No, and treating it that way causes harm. These tools output a probability based on statistical patterns, and confident human writing regularly scores as machine-like. Use a score to prompt a conversation, never as evidence on its own.
Formal, repetitive or heavily edited prose shares surface features with generated text, and writers working in a second language are flagged disproportionately. Short samples are especially unreliable because there is less text to analyse.
English is the strongest case, with other major languages supported to varying degrees. Accuracy is generally lower outside English, so weigh the result accordingly before acting on it.
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