AES Encrypt / Decrypt

Free Online AES Encryption Tool

Encrypt and decrypt text using military-grade AES-GCM encryption directly in your browser. No data is ever sent to a server.

Features

AES-128, AES-192, AES-256 — Choose your key size. 256-bit is the gold standard.

PBKDF2 Key Derivation — 100,000 iterations with SHA-256. Your password is stretched into a cryptographic key.

AES-GCM Mode — Authenticated encryption prevents tampering. Each encryption uses a random IV.

Base64 Output — Salt + IV + ciphertext packed into a single portable string.

How AES-GCM Works

1. Your password is converted to a cryptographic key using PBKDF2 (100K iterations).

2. A random 16-byte salt and 12-byte IV are generated for each encryption.

3. AES-GCM encrypts the plaintext and produces an authentication tag.

4. Salt + IV + ciphertext are concatenated and Base64-encoded.

Security Notes

- Use strong, unique passwords. AES is only as secure as your password.

- Each encryption produces different output (random salt + IV), even with the same password and text.

- AES-256-GCM is approved by NIST and used by governments worldwide.