Free · English & Chinese · No sign-up
Check essays, reports and articles for AI-generated writing. Get a calibrated AI score and sentence-by-sentence highlights, built for students, teachers and writers who work in English, Chinese or both.
Paste up to 5,000 characters, or upload a TXT, DOCX, RTF or PDF file up to 2 MiB.
Open-source models assess English and Chinese text and provide sentence highlights. If a model request fails, the tool falls back to rules and shows a notice.
Start with the highest-scoring sentences, and download a PDF report if you need one.
No. The score is an estimate. Human writing can be flagged and AI text can be missed, especially short or edited text. Never use it as the only basis for academic, hiring or other important decisions.
Open-source detection models score the text: two classifiers work together for English and one for Chinese, calibrated on thousands of labeled human and AI texts. In our tests about 1% of human texts were labeled “Likely AI”. The How It Works page has the full numbers and limits.
Detection works for English and Chinese. The website itself is available in English, Chinese, French, Spanish, Korean and Japanese.
No. Your text and files are processed to produce the result and are not stored. See the privacy policy for details.