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Free AI text detector with an overall score and sentence-level highlights.
ChatZero is a free AI detector that estimates whether text was written by AI models such as ChatGPT, GPT-6, Claude, or Gemini. It provides an overall AI likelihood score and highlights sentences that appear AI-generated. The tool is designed for English text and requires no sign-up or payment.
ChatZero is completely free to use. There are no paid plans or tiers. Optional features like saving history may be added in the future, but the core detection tool will remain free.
What is ChatZero? ChatZero is a free AI detection tool that estimates how likely text is to be AI-generated and highlights potentially AI-generated sentences.
How do I use this AI detector? Paste your text or upload a .txt/.docx/.pdf file, ensure at least 50 words, and click 'check' to get a score and highlighted sentences.
Do I need an account? No. You do not need to sign up, provide an email, or pay.
What file types can I upload? You can upload .txt, .docx, and .pdf files. Extracted text will be shown for review.
How does an AI checker actually work? AI detectors look for patterns more common in AI-generated text, such as repetitive vocabulary, smooth transitions, and generic wording. ChatZero uses these patterns to score overall and per sentence.
Does ChatZero only check ChatGPT? No. It also checks for patterns common to Claude, Gemini, and other chat models, but does not identify which model was used.
Which languages does ChatZero support? ChatZero is mainly for English. Results on other languages may be unreliable.
Is ChatZero affiliated with GPTZero or ZeroGPT? No. ChatZero is not affiliated with any other AI detector.
How accurate is ChatZero? Accuracy is not guaranteed. It can produce false positives and negatives. Results should not be used for serious academic or hiring decisions without context.
Is ChatZero more accurate than other AI detectors like ZeroGPT? No claims of superior accuracy. Different detectors may disagree because they look for different patterns.
Can an AI detector be wrong? Yes. ChatZero can struggle with heavily edited AI writing and may flag formal, repetitive, or consistent human writing.
Is a score like 40% AI a bad result? A moderate score often indicates mixed or uncertain content, common in school work. Review highlighted sentences for context.
Why would a detector flag writing I did myself? Text can be flagged due to conciseness, templates, or being written in a second language. Review flagged lines and use drafts or version history to demonstrate your process.
How do I prove I didn't use AI? ChatZero cannot prove a negative. Showing previous drafts, outlines, and version history is more effective.
Can students and teachers use this on essays? Yes. Students can check their essays, and teachers can use it as an additional review step.
Is this the same thing as a plagiarism checker? No. ChatZero detects AI-generated text, not copied content. Plagiarism checkers are separate tools.
Is ChatZero the same as Turnitin? No. ChatZero is not affiliated with Turnitin, and scores are not comparable.
Is my text saved or shown to anyone else? No. ChatZero does not publish pasted text or use student essays as examples. See the Privacy Policy for details.
