BYTETOOLS

AES Text Decrypter

Decrypt an AES-256-GCM Base64 blob back to plain text with the password used to encrypt it. Wrong passwords are detected and reported — decryption runs offline.

  • Decrypts AES-256-GCM blobs from AES Encrypt Text
  • Reads the embedded salt and IV automatically
  • PBKDF2 key derivation matching the encrypter
  • Clear, graceful wrong-password detection
  • Built on the standard Web Crypto API
  • 100% private — ciphertext and password stay local

How to use the AES Text Decrypter

  1. 1

    Paste the Base64 blob produced by the AES Encrypt Text tool.

  2. 2

    Enter the exact password used when the text was encrypted.

  3. 3

    Click Decrypt to re-derive the key and recover the message.

  4. 4

    Read the recovered plain text in the result box.

  5. 5

    If the password is wrong, fix it and try again — the tool will tell you.

About the AES Text Decrypter

The ByteTools AES Text Decrypter reverses AES Encrypt Text. Paste the Base64 blob and enter the password used to create it, and the tool recovers the original message. It reads the embedded salt and initialisation vector, re-derives the AES-256 key with PBKDF2 and decrypts the ciphertext using AES-GCM.

Because GCM is authenticated, a wrong password or corrupted blob does not produce nonsense — the decryption fails and the tool tells you clearly, so you know to check the password or the pasted text rather than trusting bad output.

Decryption happens entirely in your browser with the Web Crypto API. Your ciphertext and password are never uploaded or logged, and the tool works offline, so recovering sensitive messages stays private to your device.

Frequently asked questions

What do I need to decrypt a message?

You need the Base64 blob and the exact password used to encrypt it. The salt and IV are already embedded in the blob, so there is nothing else to supply — the tool extracts them and re-derives the key for you.

Why does it say the password is wrong?

AES-GCM verifies an authentication tag during decryption. If the password is incorrect or the blob was altered, the tag check fails and the tool reports it rather than returning corrupted text, so you can retry with the right password.

Which blobs can this decrypt?

It decrypts blobs created by the ByteTools AES Encrypt Text tool, which share the same format: a random salt, then the IV, then the AES-GCM ciphertext, all Base64-encoded together. Blobs from other tools may use a different layout.

Can the message be recovered without the password?

No. Strong AES-256 encryption is specifically designed so the plaintext cannot be recovered without the password. There is no backdoor or reset, so the password is the only key to the message.

Is my ciphertext sent anywhere to decrypt it?

No. Decryption runs in your browser with the Web Crypto API. The blob and password never leave the page, are not logged, and the tool works offline, keeping recovered messages private.

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