ROT13 / Caesar Cipher

Apply a ROT13 or custom Caesar cipher shift to your text.

How to use ROT13 / Caesar Cipher

  1. Paste your text.
  2. Set the shift (13 = ROT13).
  3. Click Apply and copy the result.

About ROT13 and Caesar ciphers

A Caesar cipher shifts each letter by a fixed number of places. ROT13 uses a shift of 13, which is its own inverse. This is for fun and light obfuscation, not real security.

Are my files uploaded?
No. Everything is processed locally in your browser, so your files never leave your device.
Is it free?
Yes — completely free, with no sign-up or watermark.

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