Handytool
UtilityFree

AI text detector

Check whether a piece of writing was generated by ChatGPT, Claude, Gemini or other AI models — free, no sign-up, sentence-by-sentence highlights.

Your text
Detection result
The AI-likelihood score and sentence-by-sentence highlights will appear here.
Characters
0
Words
0
Limit
20,000

Your text is sent to a cloud language model to generate the analysis. Handytool does not log or store the text, but do not paste confidential or regulated data.

About the AI text detector

Handytool's AI text detector estimates whether a piece of writing was produced by ChatGPT, Claude, Gemini, Llama or another large language model. Paste up to 20,000 characters and the tool returns an overall AI-likelihood score, a human/mixed/AI verdict, and sentence-by-sentence highlights so you can see exactly which parts read as machine-generated. Free, no sign-up, nothing stored.

AI text detector features

  • 01

    Sentence-level highlights

    Every sentence is scored independently and color-coded from green (human) to red (AI). Reviewers and teachers can instantly see which passages look suspicious instead of trusting a single opaque percentage.

  • 02

    Overall score and verdict

    You get a 0–100 AI-likelihood score, a human/mixed/AI verdict, and a one-line explanation of the signals the model weighed — repetition, tone, phrasing patterns and more.

  • 03

    Free, multilingual, no account

    Works for English, Spanish, French, German, Chinese, Japanese and most widely written languages. No sign-up, no watermark on results, and the tool doesn't store what you paste.

AI text detector FAQ

How accurate is this AI text detector?
No detector is perfect — neither this one nor paid tools like GPTZero or Originality. It works best on text of 100+ words. Treat the score as a signal, not proof, and always read the highlighted sentences in context before making a decision.
Which AI models can it detect?
It's designed to catch writing that looks like output from modern large language models — ChatGPT (GPT-4/GPT-5), Claude, Gemini, Llama, DeepSeek, Mistral and similar. It doesn't fingerprint a specific model; it estimates how AI-like the writing style is overall.
Is the AI detector free?
Yes. There is no sign-up, no trial limit and no watermark. The 20,000-character cap per check keeps the tool fast and free for everyone.
Does it work on languages other than English?
Yes. The underlying language model understands most widely written languages and will score text in Spanish, French, German, Portuguese, Italian, Russian, Arabic, Chinese, Japanese, Korean and more.
Is my text private?
Unlike Handytool's browser-only tools, the AI detector has to send your text to a cloud language model. Handytool itself does not log, store or share the text, but the model provider processes it to generate the result. Don't paste confidential or regulated data.
Can students fool the detector by paraphrasing?
Often, yes — light paraphrasing, adding typos or mixing AI-written and human-written sentences lowers the score. That's also why the per-sentence highlighting matters: even when the overall score drops, individual machine-written sentences often still stand out.

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