About
GPTinf is an all-in-one AI writing toolkit for anyone working with AI-generated text.
The AI Humanizer rewrites AI drafts so they read like a person wrote them. It isn't an LLM — the engine restructures sentences at the grammatical level, changing subjects, verb constructions, and clause order rather than swapping synonyms, so the original meaning and register survive. Eight rewriting modes, file upload for PDF, Word, and plain text, and unlimited freeze keywords on every plan so your terminology and proper nouns stay untouched.
The AI Detector is free and unlimited with no account required. It cross-checks 8 detectors and shows pass/fail for each one plus segment-level color coding, and it runs automatically after every rewrite — no extra click, no second tab.
Also included: a plagiarism checker with sentence-level source attribution and exact source URLs, a grammar checker running on a self-hosted engine so your text never reaches a third-party server, a paraphraser with 7 writing styles, and a readability checker built for AI-generated content.
Free tier: 300 words per request, no account needed, file upload and the full detector included. Paid plans start at $9.99/mo.