AI Undetect

AI Undetect is a web tool that checks text against multiple AI-content detectors and rewrites flagged passages so they read as human-written. It runs submitted text through detection engines including GPTZero, Copyleaks, Turnitin, Writer, Winston AI, and Originality AI, giving users a sense of how likely their content is to be flagged as AI-generated across the tools that instructors, editors, and platforms commonly use. For rewriting, the tool offers a free Manual Mode that applies basic rewriting, and a paid Auto-Perfect Mode that repeatedly refines the text until it scores as human across the connected detectors. It supports more than 20 languages and accepts uploaded documents in .txt, .md, .pdf, and .docx formats up to 10MB, in addition to pasted text. A public API is available for developers who want to build detection or rewriting into their own workflow. Pricing is tiered by monthly word allowance: the free plan covers 250 words, while paid plans starting at $5 a month (with a discount for annual billing) raise the limit into the thousands or unlimited range. Because the tool is explicitly built to defeat AI detectors, its usefulness will shift over time as detector vendors update their own models to catch these rewriting techniques.