ChatZero is a free tool that estimates how likely text is to have been generated by AI models such as ChatGPT, GPT-6, Claude, or Gemini. It also highlights sentences that appear most AI-like.

How do I use the AI detector?

Paste at least 50 words into the text box or upload a .txt, .docx, or .pdf file, then click “Check Text” to see the score and highlighted sentences.

Do I need an account?

No. ChatZero says the main detection tool is free to use without signing up or providing an email.

How accurate is ChatZero?

ChatZero does not claim a specific accuracy rate. It can miss heavily edited AI writing and may flag human writing that is formal, repetitive, or highly structured. Its score should not be treated as definitive proof.

What file types can I upload?

You can upload .txt, .docx, and .pdf files. ChatZero extracts the text for you to review before checking.

Is ChatZero a plagiarism checker?

No. ChatZero estimates whether text appears AI-generated. Plagiarism checkers look for copied content.

Which languages does ChatZero support?

ChatZero is mainly intended for English. Results for other languages may be unreliable.

Does a high AI score prove that someone used AI?

No. A score is an estimate, not proof. ChatZero recommends considering the text and other evidence, such as drafts, notes, or document version history.

ChatZero: Free AI text detector with an overall score and sentence-level highlights.

Name: ChatZero
Rating: 5 (85 reviews)
Author: toolify

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Introduction:

Free AI text detector with an overall score and sentence-level highlights.

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Nov 14 2026

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ChatZero Product Information

What is ChatZero?

ChatZero is a free AI text detector for estimating whether writing may have been generated by ChatGPT, GPT-6, Claude, Gemini, or other chat models. It provides an overall AI-likelihood score and highlights sentences that appear most AI-like. Users can paste text or upload a .txt, .docx, or .pdf file. The tool is designed as a guide rather than definitive proof, since it can produce false positives and false negatives.

How to use ChatZero?

Paste at least 50 words into the text box, or upload a .txt, .docx, or .pdf file and review the extracted text. Click “Check Text” to receive an overall AI-likelihood score and highlighted sentences. Use the result as a guide, not as proof of how the text was written.

ChatZero's Core Features

AI-likelihood scoring for text up to 5,000 words

Sentence-level highlights showing passages that appear most AI-like

Detection of patterns associated with ChatGPT, GPT-6, Claude, Gemini, and other chat models

Text input and .txt, .docx, and .pdf file uploads

No account or sign-up required

ChatZero's Use Cases

Students can review essays for passages that may sound formulaic or AI-like.

Teachers can use the score and highlighted sentences as one input when reviewing student work.

Writers and editors can check drafts and identify passages to review.

Hiring or publishing reviewers can use the result as an initial signal, alongside other evidence.

FAQ from ChatZero

What is ChatZero?
How do I use the AI detector?
Do I need an account?
How accurate is ChatZero?
What file types can I upload?
Is ChatZero a plagiarism checker?
Which languages does ChatZero support?
Does a high AI score prove that someone used AI?

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