Encrypt and decrypt text using AES-256 with a passphrase — fully client-side
All encryption happens in your browser using the Web Crypto API. Your passphrase and data are never sent to any server.
AES-256 (Advanced Encryption Standard with 256-bit keys) is the gold standard for symmetric encryption, used by governments, banks, and security-critical applications worldwide. This tool uses the browser's native Web Crypto API with PBKDF2 key derivation (100,000 iterations) and random salts/IVs for maximum security. AES-GCM (Galois/Counter Mode) provides both encryption and authentication, detecting any tampering. AES-CBC (Cipher Block Chaining) is the traditional mode. Since everything runs in your browser, your passphrase and plaintext are never transmitted over the network.