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Caesar Cipher

Shift letters to encrypt or decrypt text with any rotation.

Your text

Letters are shifted; digits, spaces and punctuation are left unchanged.

How to use the Caesar Cipher

  1. Type or paste the text you want to transform.
  2. Choose a shift between 1 and 25.
  3. Click Encrypt or Decrypt, then copy the result.

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Frequently Asked Questions

Common questions about the free online caesar cipher.

It is one of the oldest substitution ciphers: every letter is shifted a fixed number of places down the alphabet, wrapping around at the end.
Use the same shift value with the Decrypt button, which shifts letters backwards.
No. With only 25 possible shifts it can be broken by hand or in milliseconds by a computer, so use it only for puzzles and learning.
They are left exactly as they are; only letters are shifted.
Yes. Upper and lower case is preserved throughout, along with spaces and punctuation.
Yes. Values wrap around the alphabet, so a shift of 29 behaves like a shift of 3.
Yes. The tool is fully responsive and works in any modern browser on desktop, tablet and phone.
Yes, it is completely free with no account required.

Last updated: October 10, 2026