AES Descryption is an AESthetically pleasing web app which decrypts AES ciphertext. More specifically, it likes aes-256-cbc and Base64. The actual decryption is done on the client side using CryptoJS.
This was more of an exercise in web design than anything else, which is why it might appear to be slightly useless.
Your best bet is OpenSSL:
$ openssl aes-256-cbc -base64 -in secrets -out secrets.aes
Use a strong passphrase and then copy the contents of the file to your clipboard. Fire up AES Decryption, paste in the ciphertext, enter the passhrase, and click the decrypt button.
Copyright © 2012 Mitchell Kember
AES Decryption is available under the MIT License; see LICENSE for details.