UniDoc Encrypt is a 100% client-side, zero-knowledge browser and offline Progressive Web App (PWA) for secure file and folder encryption. Powered by military-grade AES-256-GCM encryption and PBKDF2-SHA256 key derivation via native Web Cryptography primitives, unencrypted files and passwords never leave your device. Featuring Origin Private File System (OPFS) streaming for unlimited file sizes, client-side directory encryption, and offline PWA functionality, it delivers instant, friction-free file protection without installation, accounts, or telemetry.