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Caesar Cipher / ROT13

Apply a Caesar shift to text (1–25) including the canonical ROT13 (shift 13). Live preview, toggle between encode and decode.

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Output
Uryyb, jbeyq!

Only A-Z and a-z shift; digits, punctuation, and other characters pass through unchanged.

How to use

  1. 1
    Pick mode and shift
    ROT13 is the default.
  2. 2
    Type or paste text
    Letters shift, everything else stays.

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