AES Encryption Tool Online

Encrypting text with AES

This tool encrypts text using AES and a key you choose. The result is a string that cannot be read without that key.

Store the key separately from the encrypted text. If the key is lost, the content cannot be recovered by any means.

How to use it

Paste the text, enter a key and start the encryption, then copy the result.

Use a key that is long and not guessable. A short, common word weakens the encryption far more than the choice of algorithm ever helps it.

Limits of this approach

AES is a widely used, well-regarded algorithm. Its security depends heavily on the quality and secrecy of the key rather than the algorithm itself.

This tool is meant for experimenting and for simple tasks. To protect genuinely sensitive data, use software built for that purpose with proper key management.

Frequently asked questions

What happens if I forget the key?

The content becomes inaccessible. There is no backdoor that recovers encrypted text without its key.

Does my input leave the device?

Processing runs in the browser. Even so, avoid pasting confidential material if you would rather it were not processed at all.

Is AES enough for confidential documents?

The algorithm itself is considered sound, but key length, key handling and how you transmit the result matter just as much. For genuinely sensitive material, use dedicated software.