Caesar Cipher – Safety Rush tools that have been thoroughly vetted by experts

Caesar Cipher Tool - Encode & Decode

Encode

Decode

Encode Text

Plain Text:

Shift Value (1-25):

Ciphertext:

Decode Text

Ciphertext:

Shift Value (1-25):

Plain Text:

About the Caesar Cipher

The Caesar cipher is one of the simplest and most widely known encryption techniques.
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 or up the alphabet.
For example, with a left shift of 3, 'D' would be replaced by 'A', 'E' would become 'B', and so on.
This tool preserves case (uppercase remains uppercase, lowercase remains lowercase) and non-alphabetic characters.
While historically significant, the Caesar cipher offers very little communication security and can be easily broken.

A simple and educational online tool for demonstrating the classic Caesar cipher. Easily encode your plaintext messages into ciphertext or decode existing ciphertext back into readable text by specifying a numerical shift value (1-25). Ideal for learning about basic substitution ciphers or for fun text transformations.