GPTZero is the most trusted AI detector for checking if content was written by an LLM such as ChatGPT, GPT-5, GPT-4, Gemini, or Copilot. GPTZero tells you where AI is used at document, sentence, and word level. Trained on a large, diverse corpus of human-written and AI-generated text, supports English, Spanish, French, German, and other languages. Served over 17 million users worldwide, works with over 100 organizations in education, hiring, publishing, data labeling, reviews, and more.
GPTZero
AI detector that identifies LLM-generated text like ChatGPT or Gemini outputs at document, sentence, and word levels for educators and writers.
FreemiumText & Writing
AI detector that identifies LLM-generated text like ChatGPT or Gemini outputs at document, sentence, and word levels for educators and writers.
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AI detector that identifies LLM-generated text like ChatGPT or Gemini outputs at document, sentence, and word levels for educators and writers.
About GPTZero
GPTZero is an AI content detector that scans text to flag generation by large language models such as ChatGPT, GPT-4, Gemini, or Copilot, helping users in education and writing workflows verify human authorship. It provides granular analysis with confidence scores, sentence-by-sentence highlighting, and AI vocabulary detection across multiple languages including English, Spanish, French, and German. Integrations like Chrome Extension, Google Docs, and LMS support enable quick checks in classrooms and workspaces.
FAQ
Use GPTZero's free AI Detector online, trusted by teachers and writers. Sign up for a free account to check texts up to 150,000 characters or batch up to 250 files. Download Chrome Extension Origin to scan entire pages in one click.
Use GPTZero to highlight possible AI use in prose across education, certification, hiring, recruitment, social writing platforms, disinformation, and more. Intended to flag for conversations and further inquiry, such as between educators and students.
No, GPTZero works across AI models including ChatGPT, GPT-5, GPT-4, GPT-3, Gemini, Claude, and services based on them.
GPTZero is the most accurate across use cases, verified by TechCrunch and others. Builds and improves own technology, unlike competitors forwarding open-source models. Finetuned for student writing and academic prose. Mission: provide tools to detect and safely adopt AI.
Do not use results to punish students; use holistically with Writing Reports. Edge cases exist where AI is classified as human or vice versa. Accuracy increases with more text length and similarity to training data (mostly English adult prose). Less accurate for heavily edited AI text or procedural text.
Work proactively with students: explain AI risks, create AI-proof assessments, require multiple drafts, use hard-to-generate formats like presentations or videos, set expectations of AI checking with tools like GPTZero.
No detector is perfect. Ask students to demonstrate understanding in controlled environment, produce writing process artifacts, check for history of AI use.
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