AI testing & review
AI detector that identifies content generated by large language models
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Free AI detection tool that scans text for content generated by ChatGPT, GPT-5, GPT-6, Gemini and other AI models with sentence-by-sentence highlighting.
GPTZero is an AI detection platform that identifies AI-generated text in documents and provides advanced writing analysis. It detects content from major AI models including ChatGPT, GPT-5, GPT-6, Gemini, Claude, and Llama with sentence-by-sentence highlighting and detailed explanations. The platform offers multiple features including Writing Replay for video verification of the writing process, plagiarism detection, grammar checking, and AI tutor feedback. GPTZero serves students, educators, publishers, recruiters, and businesses where authentic writing matters, with integrations for Google Docs, Chrome, Canvas, and other tools. The service operates globally and is compliant with FERPA, GDPR, and CCPA data protection standards.
Pricing model: Freemium
Free tier for basic AI detection up to 10,000 characters. Professional plan available with pricing details on subscription page. API pricing available for developers.
GPTZero is the first and leading AI detector that identifies specific content in documents or text generated by large language models like ChatGPT. Founded in January 2023, it has served over 20 million users and works with 100+ organizations in education, hiring, publishing, legal and other fields.
AI detectors work by identifying patterns in text more likely to be machine-written than human-written, including perplexity (predictability), burstiness (sentence length variation), and style (tone and repetition). GPTZero uses its own proprietary model analyzing hundreds of factors with industry-leading accuracy.
No. GPTZero works across a wide range of AI language models including ChatGPT, GPT-3, GPT-4, GPT-5, GPT-6, Gemini, Claude, Llama, Deepseek, and AI services based on those models. The detector is designed for highest accuracy regardless of which model produced the text.
GPTZero fully supports English, German, Portuguese, French and Spanish with industry-leading accuracy. The service is used in many other languages and in over 100 countries.
You can start using GPTZero straight away in 3 easy steps: Paste Text or Upload Document: Paste in raw text or upload your file for review and press 'Scan'. For scans over 10,000 characters, create a free account first. See Your Results: GPTZero will suggest what percentage of your text is likely to be AI-generated and highlight the specific phrases it has detected. Download our Chrome Extension for Google Docs and web: View AI detection and typing pattern metrics on any page, allowing you to spot AI-created content with ease.
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GPTZero has a free listing. The owner can unlock the full profile with a paid launch for $5:
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