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Caesar Cipher Encoder

Encrypt and decrypt text with a Caesar shift cipher, including ROT13.

To use a Caesar cipher, enter your text and a shift amount. Each letter moves that many places through the alphabet, wrapping from Z back to A. A shift of 13 gives ROT13, which is its own inverse — applying it twice returns the original text.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Is a Caesar cipher secure?

Not at all. With only 25 possible shifts it can be broken by hand in seconds. It is a teaching example and a puzzle device, not a way to protect real information.

How to use the caesar cipher encoder

  1. 1Enter or paste your text.
  2. 2Set the shift.
  3. 3Choose the mode.
  4. 4The result appears immediately — copy or download it.

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Put the working caesar cipher encoder on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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