AES-GCM Encrypt Decrypt Online — Key, IV & Tag (Local)
Free AES-GCM encrypt/decrypt in your browser: paste hex key and IV, optional AAD, Base64 or hex ciphertext including the 128-bit auth tag. Text and file modes — keys never leave this device.
Frequently asked questions
No. Key material and plaintext never upload. Nothing is sent to LocalTools servers for processing.
Never reuse a GCM IV/nonce with the same key; generate fresh random IVs per message.