ROT13 & ROT47 Converter

Apply the classic ROT13 letter-substitution cipher or the extended ROT47 ASCII cipher to your text.

What is ROT13 and ROT47?

ROT13 (Rotate by 13 places) is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. Because there are 26 letters in the alphabet, ROT13 is symmetric—meaning applying the algorithm twice will return the original text. It is famously used on technical forums to hide spoilers or puzzle solutions.

ROT47 is a derivative of ROT13 that operates on a much larger set of visual ASCII characters (numbers, punctuation, and letters). Instead of shifting by 13 over an alphabet of 26, it shifts by 47 across the 94 printable ASCII characters (from '!' to '~'). This obfuscates the text much more thoroughly!

How to use

  1. Select mode: Choose either ROT13 or ROT47 using the toggle buttons at the top.
  2. Type or Paste: Add your text to the input field. The conversion runs instantly in real-time as you type.
  3. To Decrypt: Because these ciphers are symmetric, simply paste an encrypted message into the input box and it will instantly decode it back to readable text!