Encryption / Decryption Tool

Encryption is the process of encoding information in such a way that only authorized parties can access it and those who are not authorized cannot. Decryption is the reverse process, converting encrypted data back into its original form.

Encryption plays a vital role in securing data, protecting privacy, and ensuring the authenticity of digital communications. It is fundamental to modern cybersecurity.

Using this tool takes five steps, whether you're encrypting a message or reversing an existing ciphertext back to plaintext. The same panel handles both directions. Just switch modes and the interface adjusts automatically.

Everything happens locally in your browser. Your text and key are never transmitted to any server.

This tool implements three symmetric algorithms, AES, DES, and TripleDES, plus a Caesar Cipher mode for classic substitution encoding. All three symmetric algorithms use the same secret key for both encrypting and decrypting your text, running in CBC mode with Pkcs7 padding and a random salt generated on every encryption call.

That random salt is why encrypting the same text twice with the same key produces different-looking output each time. This is expected behavior, not a bug. You can tell the output apart from other encoding formats by its start: it always begins with U2FsdGVkX1, which is the Base64 encoding of the literal text Salted__.

If you're not sure which to pick: use AES. DES and TripleDES exist in this tool so you can decrypt or interoperate with older systems that still use them, not as recommendations for new encryption.

Every example below was generated by actually running the encryption (not written by hand) and verified to decrypt back to the original text. If you try these yourself, your output will look different even with the identical text and key. That's the random salt at work, not an error.

Note the accented character, em dash, Chinese characters, and emoji in the unicode row, that's the exact multi-byte case your new AES round-trip test now covers, and it decrypts back correctly here too.

For integrity checks rather than confidentiality, use our HMAC Generator to confirm a message was not changed. For classic shift ciphers rather than real encryption, use the ROT13 & Caesar Converter.

This Encryption / Decryption Tool operates entirely client-side within your browser. Your input text and keys are never sent to our servers, which means there's nothing for us to log, store, or lose in a breach.

That said, client-side encryption has a real limitation worth understanding: if the device or browser itself is compromised, a locally-stored key isn't automatically safe. For highly sensitive data, use a trusted server-side environment with proper key management rather than relying on browser-based encryption alone.

These three terms get confused constantly, and the difference matters for choosing the right tool.

Encryption is reversible: it transforms data to protect confidentiality, and the original can be recovered with the correct key. That's what this tool does. Hashing is one-way: it converts data into a fixed-size string for integrity verification, and it cannot be reversed to retrieve the original. Use our Hash Generator for that. Encoding (like Base64) isn't security at all. It's a reversible format conversion anyone can undo without a key, useful for transmitting data through text-only channels. See our Base64 Encoder/Decoder.

A strong algorithm with a weak key still produces weak encryption. The key is what actually protects your data.