Encoders & Decoders

AES Encryption/Decryption

Encrypt and decrypt data using AES encryption

Encrypt and decrypt text with AES, a widely trusted symmetric cipher, directly in your browser. Provide a passphrase or key to protect a message, then share the ciphertext knowing only someone with the same key can read it. Everything runs locally, so your secrets never leave the page.

Runs 100% in your browser · no upload, no tracking, no ads

Encryption Key (256-bit hex)

Initialization Vector (128-bit hex)

Plain Text

Encrypted Text

Result will appear here...

AES Encryption

• Uses AES-256-CBC encryption
• Requires 256-bit key (64 hex chars)
• Requires 128-bit IV (32 hex chars)
• PKCS7 padding
• Base64 encoded output

Security Notes

• Keep your key and IV secure
• Use different IV for each encryption
• Never reuse keys for different data
• Store keys separately from encrypted data
• Consider using key derivation functions

How to use AES Encryption/Decryption

Enter the text you want to encrypt or the ciphertext to decrypt.
Provide your secret key or passphrase.
Choose to encrypt or decrypt.
Copy the resulting ciphertext or recovered plaintext.

Frequently asked questions

Is AES secure?

AES is a standardized, widely vetted symmetric cipher used across the industry. Its security depends on keeping the key secret and using a strong, unique passphrase.

What happens if I lose the key?

There is no recovery. AES is symmetric, so the exact key used to encrypt is required to decrypt. Store it safely.

Does my data get uploaded?

No. Encryption and decryption run entirely in your browser, so neither your plaintext nor your key is transmitted.

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