What AES modes are supported?

We support AES-CBC (Cipher Block Chaining) and AES-ECB (Electronic Codebook). CBC is recommended for better security. AES-128, AES-192, and AES-256 key sizes are all supported.

Do I need to keep the IV (Initialization Vector)?

Yes. For AES-CBC mode, you must store the IV alongside the ciphertext to decrypt it later. The IV is automatically generated and shown in the output.

Free AES Encryptor / Decryptor - Online AES Encryption

AES Mode

Key Size

Output Format

Secret Key

IV (Initialization Vector) — auto-generated if left empty

Input Text

Output

Result will appear here...

Frequently Asked Questions

1. Is AES encryption secure?

AES (Advanced Encryption Standard) is a NIST-approved symmetric encryption standard used worldwide. AES-256 is considered highly secure for government and commercial use.

2. Is my data sent to your server?

No. All encryption and decryption is performed locally in your browser using the Web Crypto API. Your data never leaves your device.

3. What is the difference between CBC and ECB mode?

CBC (Cipher Block Chaining) uses an IV and chains blocks together, making it more secure. ECB (Electronic Codebook) encrypts each block independently and is not recommended for sensitive data. CBC is the default and recommended mode.

4. How do I decrypt my data later?

You need three things: the encrypted text, the same secret key, and (for CBC mode) the IV that was used during encryption. The IV is shown in the encryption output — save it along with the ciphertext.