toolsko

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Caesar Cipher Encryptor & Decryptor

Rotate alphabet characters by any shift key (1 to 25) or ROT13.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Classic substitution cipher shifting each letter down the alphabet by a fixed integer key.

How to use it (step by step)

  1. 1Fill in the boxes: “Message Text”, “Alphabet Shift (1 to 25)”, “Mode”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Morse code / cipher
Old ways of writing messages with codes: Morse uses dots and dashes; a cipher swaps letters by a rule. Fun for puzzles, not for real secrets.

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