FAHAQ

ROT13 Encoder / Decoder

Apply the ROT13 letter cipher, live.

ROT13 is its own inverse — encoding twice returns the original text. Only A–Z letters are shifted.

Free ROT13 encoder and decoder. Shift every letter 13 places to obfuscate or reveal text. Because ROT13 is its own inverse, the same operation encodes and decodes. Runs live in your browser.

How to use the ROT13 Encoder / Decoder

  1. 01Type or paste your text.
  2. 02The ROT13 result updates live.
  3. 03Copy the result, or feed it back in to decode.

Frequently asked questions

Is ROT13 secure?

No. ROT13 is a simple letter-substitution cipher meant for hiding spoilers or lightly obscuring text, not for real security. Anyone can reverse it instantly.