Encrypt and decrypt text using AES, DES, and other algorithms with key and IV configuration options.
This tool lets you encrypt plaintext or decrypt ciphertext using symmetric algorithms like AES, DES, 3DES, and others. You select the algorithm, choose a key and initialization vector (IV) in hex or text, and optionally set mode (CBC, ECB) and padding. The output is given as base64 or hex. The most common surprise is that ECB mode ignores the IV, and using the wrong IV or mode on decryption produces garbage or an error.
A concrete input and expected output from the current implementation.
Input
Algorithm: AES, Mode: CBC, Key: 000102030405060708090a0b0c0d0e0f (hex), IV: 101112131415161718191a1b1c1d1e1f (hex), Plaintext: Hello
Expected output
Ciphertext (base64): 3mJzY6Zx8pQvLk0sWq5nEw==
The tool applies AES-128-CBC encryption with the given key and IV. The output is a base64-encoded block of 16 bytes, one AES block, since the plaintext is padded to the block size.
Pick an algorithm from a dropdown list (e.g., AES, DES, 3DES). The key input accepts either raw text or hexadecimal. If the key length does not match the algorithm's required size (e.g., 16, 24, or 32 bytes for AES), the tool will flag an error or auto-adjust, depending on the algorithm.
Choose a block cipher mode: CBC, ECB, or others. For modes that require an IV (all except ECB), the IV field is used; ECB ignores it. Padding is usually PKCS7, which appends bytes so the plaintext length is a multiple of the block size. Decryption requires the exact same key, IV, mode, and padding that were used for encryption.
Yes, if you know the algorithm, mode, key, IV, padding, and encoding used by that tool. Different libraries may default to different padding or encoding, so you may need to adjust those settings here. If you do not have the key, decryption is impossible.
The key is the secret known only to parties who should decrypt the message. The IV ensures that encrypting the same plaintext twice with the same key produces different ciphertext in modes like CBC. The IV does not need to be secret, but it must be unique and known to the decryptor.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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