AES Decrypt

Decrypt AES ciphertext back to plaintext.

Mode

Password / Key

Ciphertext (iv:ciphertext, hex)

Note: The key is derived from the password with SHA-256 and a fresh random IV is used for every encryption. The output format is iv:ciphertext as lowercase hex. For AES-GCM the ciphertext is authenticated (tamper and wrong-password detection); CBC and CTR are not — use GCM for secure data.

What Is a AES Decrypt?

The AES Decrypt tool decrypts AES ciphertext back into plaintext entirely in your browser. It accepts the iv:ciphertext format produced by the AES Encrypt tools and reconstructs the original text using the password you provide. This free online tool is useful for AES decrypt tool, AES decryption online, decrypt AES ciphertext. Common use cases include testing, local data recovery, interoperability checks, and encryption development. It is designed for quick browser-based hashing, encoding, decoding, encryption testing, checksum comparison, identifier generation, and cryptography education. For production security, follow the algorithm's current standards, key-management requirements, and application-specific security guidance.

How to Use This AES Decrypt

1
Choose the algorithm or modeSelect the encryption method supported by the tool.
2
Enter the required key materialProvide the password, key, and nonce/IV in the format requested.
3
Enter the dataPaste plaintext for encryption or ciphertext for decryption.
4
Run the operationThe browser performs the cryptographic transformation locally.
5
Verify the resultFor real applications, follow the algorithm's nonce, key-management, authentication, and interoperability requirements.

Frequently Asked Questions

AES-GCM includes an authentication tag. Wrong passwords, tampered ciphertext, or corrupted IVs cause decryption to fail with an error instead of returning garbage.

Yes, as long as it uses the same mode, the same key derivation (SHA-256 of the password), and the same iv:ciphertext hex format used by this tool.

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