StealthHumanizer

StealthHumanizer is an open-source AI text humanization platform that helps users transform AI-generated writing into natural, human-like content using their preferred AI provider. They are designed for writers, students, developers, researchers, and content creators who want complete control over the humanization process without relying on a proprietary cloud service. The platform supports 35 AI providers, multiple rewrite strategies, offline privacy mode, and browser-based processing, allowing users to rewrite content while keeping their own API keys private and under their control.

They offer a comprehensive toolkit that includes AI Humanizer, AI Detector, Batch Processing, Grammar Checking, PDF/DOCX uploads, rewrite history, dashboards, and customizable humanization settings. Users can choose from four rewrite levels, 13 tone presets, 16+ languages, and multiple writing styles such as Academic, Professional, Casual, Creative, and Technical. As an MIT-licensed open-source project, StealthHumanizer is self-hostable, privacy-focused, and supports browser-based API key management, offline local rewriting, Chrome extension integration, and multi-pass humanization workflows for flexible content refinement.

And the best part? They are completely free and open source, requiring no login to use. There are no subscription fees, while users can optionally connect their own supported AI provider API keys for advanced processing and extended capabilities.