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AI testing & review
ChatZero
Free AI detector for ChatGPT, GPT-6, Claude and Gemini that scores text and highlights likely AI-generated sentences
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- DR by Ahrefs
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A free web-based tool that detects AI-generated text by analyzing patterns and providing an AI likelihood score with sentence-level highlighting.
What it is
ChatZero is a free AI detector that helps users identify text likely generated by AI models including ChatGPT, GPT-6, Claude, and Gemini. Users paste text or upload .txt, .docx, or .pdf files to receive an AI likelihood score between 0-100 and sentence-level highlighting showing which parts appear most AI-like. The tool analyzes patterns common in AI-generated text such as repetitive vocabulary, smooth transitions, and generic wording. No account, sign-up, or payment is required. ChatZero is designed for students checking essays, teachers reviewing student work, writers and editors, and others needing to assess whether text may have been AI-generated. The tool emphasizes that its results are estimates and should be used as a starting point rather than definitive proof, noting that it can produce false positives on well-written or formal human text and may miss heavily edited AI content.
What it is built with
- Sentence-level highlighting of AI-like text
- Paste text or upload files (.txt, .docx, .pdf)
- Detects patterns from ChatGPT, GPT-6, Claude, and Gemini
- No sign-up or account required
- Private text processing
- Minimum 50 words required for checking
- Identifies repetitive vocabulary and generic wording patterns
- Works in browser without installation
Pricing
Pricing model: Free
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ChatZero metrics
| Metric | Value |
|---|---|
| Trust Flow | 0 no change since last check |
| Citation Flow | 0 no change since last check |
| Referring domains | 0 no change since last check |
| External backlinks | 0 no change since last check |
Majestic benchmarked 13 Nov 2026, rebuilt 13 Nov 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
ChatZero domain build sheet
Open the build sheet
| Domain age | 2 days |
|---|---|
| Registered | |
| Expires | |
| Registrar | Cloudflare, Inc. |
| DNSSEC | Not signed |
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Questions from the bench
- What is ChatZero?
- ChatZero is a free AI detection tool where you paste text or upload a file to determine how likely the text is to be AI generated by models such as ChatGPT, GPT-6, Claude, or Gemini. It highlights parts of text that are likely to be AI generated.
- Do I need an account?
- No, you do not need to sign up, put in an email, or pay to use ChatZero. Although optional features like saving your history may be added in the future, the main detection feature will always remain free.
- How does ChatZero detect AI-generated text?
- ChatZero analyzes patterns in text that are more common in AI-generated texts, including repeating vocabulary, very smooth transitions between sentences, and generic wording. It provides an overall score and a score per sentence based on these patterns.
- What file types can I upload?
- You can upload .txt, .docx, and .pdf files. The extracted text will be shown in the input box, though if the file cannot be read clearly you will receive an error.
- Is ChatZero only for detecting ChatGPT?
- While ChatZero mainly focuses on detecting ChatGPT, it looks for patterns common to many popular chat models including Claude and Gemini. It will not tell you which specific model was used to create the text.
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