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Caesar Cipher

Encrypts text with a Caesar cipher by moving each letter along the alphabet. To decode, use 26 minus the shift.

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What is Caesar Cipher?

The Caesar cipher is one of the oldest and simplest ways to hide a message. Each letter is replaced by the letter a fixed number of places further along the alphabet.

What this tool does

Shifts every letter of your text by the number you choose and keeps the case. Numbers, spaces and punctuation are not changed. To decode, choose 26 minus the shift that was used.

How to use it

  1. Type or paste your message.
  2. Choose the shift.
  3. Copy the result, or use 26 minus the shift to decode.

Did you know?

  • Julius Caesar is said to have used a shift of three to protect messages to his generals.
  • The cipher is very easy to break because there are only 25 possible shifts.

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