Caesar Cipher

Shift letters of the alphabet by a specific key value to encrypt or decrypt messages.

What is the Caesar Cipher?

Named after Julius Caesar, who used it to communicate securely with his generals, the Caesar Cipher is one of the oldest structural cryptographic algorithms known. It's a type of substitution cipher where each letter in the original text is shifted a certain number of spaces up or down the alphabet. For example, with a shift of 3, 'A' becomes 'D'.

How to use

  1. Select your Key: Use the number input to specify exactly how many spaces you want your letters to shift.
  2. Input Text: Paste or type your message into the Input box.
  3. Encrypt or Decrypt: By default, the tool "Encrypts" by shifting letters to the right in the alphabet. Click the toggle button at the bottom to switch to "Decrypting" (which shifts letters to the left).