AES-256 Encryption & Decryption - Online Encrypt/Decrypt Tool

AES Encryption / Decryption

Encrypt and decrypt text using AES-256-GCM. Everything runs locally in your browser - no data is sent to any server.

Security Notice: This tool uses the Web Crypto API (AES-256-GCM) with a key derived from your passphrase via PBKDF2 (100,000 iterations). Keep your passphrase secret.

Mode

Encrypt Decrypt

Passphrase (Secret Key)

Plaintext (Text to Encrypt)

Encrypted Output (Base64)

How AES-256-GCM Works

256-bit Key Size

GCM Authenticated Mode

PBKDF2 Key Derivation

AES-256-GCM provides both confidentiality and authenticity (tamper detection)
PBKDF2 with 100,000 iterations derives a secure key from your passphrase
A random salt and IV are generated for each encryption
Output is Base64-encoded and contains salt + IV + ciphertext