Password & Keys

Simple Encryption Tester

Encrypt or decrypt small messages with AES-256/CBC to sanity-check keys, IVs, and payloads.

All processing happens in your browser using the Web Crypto API. For real systems, use proper key management and vetted libraries.

Mode & input

Choose encrypt or decrypt, then paste your key, IV, and data. Key and IV are interpreted as hex.

Algorithm Key (256-bit, hex) IV (128-bit, hex) Plaintext

Decrypt mode accepts ciphertext as base64 or hex. If decryption fails, check that the algorithm, key, IV, and encoding match the source.

Copy the output into your scripts or notes. Use this as a playground, not a key store.

Ciphertext (base64)

Ciphertext (hex)