AIGPTZero

About the tool

AIGPTZero is a web-based AI content detector. You paste text or upload a PDF or DOCX file, and it estimates how likely the text is to be human-written, AI-generated or mixed, with a confidence band for the whole document. Sentence-level highlights show which passages most influenced the score, so a reviewer can check them in context. The site says it covers text from ChatGPT, GPT-5, GPT-4o, Gemini 2.5, Claude, DeepSeek, Qwen, Llama, Grok and Copilot, in 16 listed languages. It is aimed at students checking essays before submission, teachers reviewing assignments, editors and publishers screening articles, and recruiters reading resumes and cover letters. The site presents results as signals that support human judgment rather than proof, and notes that short, translated or heavily edited text is harder to classify. There is also an AI GPT Zero Detector GPT inside ChatGPT. API and LMS access are mentioned, but only by contacting support. The header says the site is powered by ZeroGPT, and no company is named. Free scans are limited to 1,000 characters with a daily allowance. Paid plans add unlimited detections, up to 50,000 characters per scan, file upload, no ads and downloadable PDF reports. Pro costs $19.99 a month or $14.99 a month billed yearly ($179.88) for 300,000 words a month, Business $39.99 or $24.99 a month billed yearly, and Ultra $99.99 or $49.99 a month billed yearly. Purchases are non-refundable.