🥷 StealthHumanizer — Free, Open-Source AI Text Humanizer
Transform AI-generated text into natural, human-like writing. 100% free, open source (MIT), no login, no limits, no server-side storage of your work.
- 🌐 Try it live: https://stealthhumanizer.vercel.app — zero config: the hosted app ships with a free, pre-configured model, so you can paste text and humanize without any API key
- 💻 Source: https://github.com/rudra496/StealthHumanizer
- 📄 DOI: 10.5281/zenodo.22118705
What it does
- 35 AI providers (20+ free — Gemini, Groq, Z.AI GLM-5, OpenRouter, Cerebras, NVIDIA NIM, Perplexity, Fireworks, plus local Ollama / LM Studio / vLLM)
- Rudra's Free Usage Model (v2.4): the public deployment auto-routes by input length — a purpose-built BART humanizer for short text, gemma3:4b via Ollama for long-form, and a RoBERTa AI-detector verdict on every result, all hosted free
- 4 rewrite levels — Light, Medium, Aggressive, Ninja (5-pass auto-loop)
- 6 writing styles, 9 text purposes, 13 tone presets
- Target human-score control (50–100%) with automatic re-humanization of flagged sentences
- 12-metric AI detection engine — perplexity, burstiness, vocabulary diversity, AI-phrase density, hedging, quantifiers, contractions — plus Flesch, Flesch-Kincaid and Coleman-Liau readability scores
- 16+ languages auto-detected; per-sentence alternative rewrites; side-by-side diff view
- TXT/DOCX export, 50-entry history, dark/light mode, fully mobile-responsive
How it works
- Paste your AI-generated text (up to 10,000 words)
- Pick rewrite level, style, tone and target human score
- The multi-pass engine rewrites with human patterns and re-humanizes flagged sentences until the target is reached
- Copy or export as TXT/DOCX
Privacy by design
API keys stay in your browser's localStorage. The hosted free tier sends text over HTTPS straight to the inference backend — no databases, no accounts, no tracking. MIT-licensed and fully auditable.
Tech stack
Next.js 14 (App Router) · TypeScript · Tailwind CSS · native fetch() (zero SDK dependencies) · Vercel + GitHub Pages deployments · GitHub Actions CI
Built With
- nextjs
- ollama
- tailwindcss
- typescript
- vercel
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