Encrypt or decrypt text online using the classic Caesar Cipher algorithm. Customize shift values and encoding instantly.
A Caesar Cipher Tool shifts each alphabetical character in a string by a specified number of places. It was named after Julius Caesar, who used it to communicate with his generals.
1. Enter the text you want to process.
2. Choose the shift key (value from 1 to 25).
3. Toggle between "Encrypt" and "Decrypt" modes.
4. Copy the resulting encoded or decoded text.
The Caesar Cipher is one of the earliest and simplest cryptographic methods. It is a type of substitution cipher in which each letter in the plaintext is shifted a fixed number of positions down the alphabet.
It is highly insecure and can be easily broken. Since there are only 25 possible shift keys, a simple brute-force attack can decode it in milliseconds. It is primarily used for educational and recreational purposes today.