Hub ROT13 / Caesar Cipher
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ROT13 & Caesar Cipher

Encode or decode text with ROT13 (shift 13) or any custom Caesar cipher shift 1–25. Type in either box — results update live.

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How to use
  1. Choose ROT13 (fixed shift of 13) or Caesar Cipher (any shift 1–25).
  2. Type or paste text into either box — the other side updates instantly.
  3. Copy the result with the Copy button under each panel.
FAQ

ROT13 shifts each letter by 13 positions. Because there are 26 letters, applying ROT13 twice gives back the original text — it's its own inverse. Commonly used to obscure spoilers and puzzle answers online.

The Caesar cipher shifts each letter by a fixed number of positions in the alphabet. Julius Caesar reportedly used a shift of 3. ROT13 is simply Caesar with shift=13.

No — only A–Z letters are shifted. Numbers, punctuation, and spaces pass through unchanged.