Secure File Encryption Tool
Zero-knowledge, client-side encryption that ensures your files never leave your device unencrypted. Complete privacy guaranteed.
How It Works:
- Client-side encryption - Files are encrypted in your browser before any upload
- AES-256-GCM encryption with PBKDF2 key derivation (100,000+ iterations)
- Secure token generation - Tokens contain critical decryption parameters and must be stored securely
- Zero-knowledge architecture - The website cannot access your files or tokens
- Works in modern browsers with Web Crypto API support (Chrome, Firefox, Edge, Safari)
Technical Details
Security Implementation
- AES-256-GCM authenticated encryption - Provides both confidentiality and integrity protection
- PBKDF2-SHA256 key derivation - 100,000+ iterations to resist brute force attacks
- Cryptographically secure random numbers - For salts and IVs using window.crypto.getRandomValues()
- File integrity verification - Built into GCM mode authentication
- Secure token storage - Tokens contain critical decryption parameters and must be protected like passwords
Technical Implementation
- File API - Handles file uploads and slicing for large files
- Web Crypto API - Provides all cryptographic operations
- ArrayBuffer/Blob - Efficient binary data handling
- Progress Events - Real-time feedback for large file operations
- Error Handling - Clear user feedback for all failure scenarios
Browser Requirements
Modern browser supporting:
- Web Crypto API (Chrome 37+, Firefox 34+, Edge 12+, Safari 11+)
- File and Blob APIs
- Typed Arrays (ArrayBuffer, Uint8Array, etc.)
Encrypt a File
Drag & drop files here or click to browse
Password Strength:
Weak
Important: Save this token securely! Without it, your file cannot be decrypted.
