無料AI AI検出器

GPTINF's AI Detector scans a piece of writing and estimates how likely it is that the text was produced by a large language model such as ChatGPT, Gemini, Claude, or Llama. Paste or upload up to 10 MB of text and the detector analyzes it at the sentence level, looking at word choice, sentence rhythm, and the kind of predictable phrasing that transformer models tend to produce. Within seconds you get an overall AI-content score plus a highlighted, sentence-by-sentence breakdown so you can see exactly which parts of the draft read as human, mixed, or likely AI-generated.

The detector is built to help you make an informed judgment call, not to hand down a verdict. A high score means a passage shares strong statistical patterns with known AI writing; it does not prove who wrote it. That is why every result comes with three tiers — likely AI-generated, mixed or paraphrased, and likely human-written — instead of a single pass/fail label. Students can use it to sanity-check a draft before submitting, teachers and editors can use it as a first-pass review signal, and writers can use it to spot generic-sounding sentences worth rewriting in their own voice.

If a section does come back flagged, you do not need to start over. Send the flagged text straight into the AI Humanizer to rewrite it in a more natural, human-sounding style, or run it through the Paraphrasing Tool to rephrase specific sentences while keeping the original meaning. For academic or published work, it is also worth running the same draft through the Plagiarism Checker, since AI detection and originality checking answer two different questions: one estimates writing patterns, the other checks for matching text from other sources. Used together, GPTINF's tools give you a complete picture before you hit publish or submit.