ROT13 is its own inverse: run the result through again and you get the original text back.
Frequently asked questions
What is ROT13?
A Caesar cipher with a fixed shift of 13. Because the alphabet has 26 letters, applying ROT13 twice returns the original text.
What is it used for?
Hiding spoilers, puzzle answers and email addresses from casual reading. It offers zero real security.
Does it affect numbers?
No. Only letters rotate; numbers, spaces and punctuation stay the same.
Preview
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