Free AI Detector for ChatGPT, Claude and Gemini text
ZeroClaude tells you how much of a text was written by AI — sentence by sentence
Rewrite flagged text so it reads naturally
Instructions for educators and evaluators
*Scores are probabilistic. A high score means the writing shares many traits with AI output, not that misconduct occurred.
- Check texts of at least 150 words; short texts are less reliable.
- Formal, templated writing (abstracts, legal text, product copy) can look AI-like.
- Use the result to start a conversation: ask for drafts, notes or version history.
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Simple and credible detection for OpenAI, Claude, DeepSeek, Grok and Gemini text — for free
What sets ZeroClaude apart
Highlighted sentences
Every sentence that looks machine-written is highlighted, with a gauge showing the share of AI in the whole text.
All-in-one toolkit
Humanizer, paraphraser, summarizer, grammar checker, translator, email helper and more, all next to the detector.
Model + statistics
A large language model's judgement is blended with burstiness and phrase statistics to reduce false positives.
PDF report
Export any result as a clean PDF report to keep as a record or share with others.
Many languages
Works on English, Chinese and other major languages out of the box.
File upload
Upload .txt, .docx or .pdf files instead of copying and pasting.
The API covers the AI detector, humanizer, paraphraser, summarizer, grammar checker, translator and chat.
A simple JSON interface you can call from any language.How ZeroClaude detection works
Two independent signals, one score
Our pipeline looks at a text from two angles. A large language model reads each sentence and estimates how likely it is to be machine-written, looking for the uniform rhythm, hedged generalities and stock transitions typical of AI. In parallel, statistical checks measure sentence-length variation, the density of phrases that language models overuse, and informal markers people naturally leave behind. Blending both reduces false positives on careful human writing and catches lightly edited AI text.
Explore the technologyUse ZeroClaude wherever you write
Check text in the browser, connect your own apps through the API, or keep a history of your checks in your free account.
API
Send a POST request with your text and get JSON back with the AI percentage and per-sentence scores.
Account dashboard
Create a free account to keep a history of your checks (scores and dates only — never your text).
All tools, one place
Switch between the detector, humanizer, paraphraser and more from the sidebar without losing your text.
Explore more tools to level up your writing
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FAQ