Free
Added on Nov 15,2026
ChatZero is a free AI detector that checks whether text is likely to have been written by ChatGPT, GPT-6, Claude, Gemini or other chat models. Users paste text, or upload a file, and receive an AI score with highlighted sentences in a few seconds.
It gives an overall AI likelihood score from 0 to 100 with a short description such as looks mostly human or mixed, and highlights the sentences that pushed the score up or down so users can see which parts read as most AI-like.
The checker looks for patterns common in AI-generated writing, such as repetitive sentence structures, sentences of very similar length, generic language and stock phrases. It does not say which model wrote a given sentence.
Key features include checks of up to 5,000 words, file upload for .txt, .docx and .pdf documents with a chance to review the extracted text, sample human and AI texts to try, and a URL option. At least 50 words are recommended for a useful result.
The site explains its limits plainly. Results can be wrong both ways, formal or formulaic writing and text by second-language writers can be flagged, and a score is not proof of cheating. It is an AI text checker, not a plagiarism checker.
Privacy: pasted text is not published or sold, and no account is needed. The site says optional logins may be added in future to save history, but the basic detector will stay free.
Pricing: free to use with no sign-up and nothing to install.
It is suited to students checking their own essays, teachers reviewing drafts and in-class writing as one input among several, and writers, editors and hiring or publishing reviewers who want a quick AI check.
Popular alternatives to ChatZero include Getsolved.ai, GPTZero and AI Image Detector. Compare their pricing and what each is best for below.
| Tool | Pricing | Best for |
|---|---|---|
| Getsolved.ai | Freemium | Writers, students, content teams and professionals who want to check and improve how their writing reads. |
| GPTZero | Freemium | Teachers, universities and editors who need to check essays and articles for AI-written or copied passages. |
| AI Image Detector | Free | Journalists, moderators and digital artists who need a quick first check on whether an image was made by AI. |
| Pixlyze | Free | Journalists, educators and content moderators who need a quick check on whether an image was made with AI. |
| ContentDetector.AI | Free | Editors and writers who want a rough check on which passages of a draft read as repetitive or formulaic. |
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