ROT13 & Caesar Cipher

Apply a Caesar shift to text. Default 13 = ROT13 (its own inverse). Letters shift; everything else passes through.

100% freeNo sign-upRuns in your browserNo upload · data stays private

📖 Read the full ROT13 & Caesar Cipher guide — how it works, examples & FAQ →

How to use this tool

  1. Paste your text.
  2. Set the shift (13 = ROT13).
  3. Copy the result; apply the same shift again to reverse ROT13.

Example

"Hello" with shift 13 → "Uryyb"

Why it's private

This tool runs entirely in your browser using JavaScript. Whatever you paste is processed on your own device — it is never uploaded to a server, logged, or stored. Built by Calabi, which also strips AI metadata and C2PA signals from images and video.

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