The Caesar Cipher is one of the simplest and most widely known encryption techniques. Named after Julius Caesar, who used it to communicate with his generals, it is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is completely symmetrical—if you shift text forward to encode it, you simply shift it backward by the exact same number to decode it. Our tool processes all characters instantly and leaves non-alphabet characters (like numbers and symbols) completely untouched.
No, all encryption and decryption processes happen locally inside your web browser using JavaScript. We do not store, track, or save any of your messages.
No! The Caesar Cipher is a basic historical encryption technique meant for learning, puzzles, and fun. It is easily broken and is not secure enough to protect modern passwords or sensitive data.