Decrypt AES-256-GCM ciphertext
ciphertext = (from AES-256-GCM Encrypt)key = (from AES-256-GCM Encrypt)nonce = (from AES-256-GCM Encrypt)tag = (from AES-256-GCM Encrypt)
Result: The original plaintext.
AES-256-GCM Decrypt
Decrypt ciphertext encrypted with AES-256-GCM. Requires the correct 256-bit key, nonce, and authentication tag. If the ciphertext has been tampered with or the wrong key is used, decryption fails. This is the counterpart to AES-256-GCM Encrypt.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What if decryption fails?
Decryption fails if: (1) the wrong key is used, (2) the ciphertext has been modified, (3) the nonce doesn't match, or (4) the AAD doesn't match. AES-GCM provides no partial results - it either succeeds completely or fails completely.
Can I use this with AES-GCM Encrypt output?
Yes. The output format is compatible. AES-256-GCM Encrypt produces ciphertext, nonce, and tag that can be decrypted here (and vice versa).
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