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AES Encrypt/Decrypt

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Security & Encryption

AES Encrypt/Decrypt

Encrypt and decrypt text using AES-256-CBC.

Workspace

Run the tool here

Browser utility

Input

Encryption key

Mode

Output

Run the workspace to see the response here.

How to use

Enter the plaintext or ciphertext.
Provide a key of the correct length.
Choose encrypt or decrypt and copy the result.

About this tool

Encrypt or decrypt text with AES using a key and mode, for learning and controlled test data.

AES Encrypt/Decrypt is part of the TmpMailer Security & Encryption set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Understanding symmetric encryption.
Encrypting a test payload.
Checking an AES implementation against known vectors.

Common questions

Is this suitable for production secrets?

Use a vetted library with authenticated encryption (AES-GCM), a random IV and proper key management. Browser demos are for learning.

What key length should I use?

AES-256 with a 32-byte key is the common modern choice. Never reuse a key across unrelated systems.

Why does the ciphertext look different each time?

A random IV is used per encryption. You must store the IV with the ciphertext to decrypt later.

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