ROT13 Encoder/Decoder

ROT13 ("rotate by 13 places") is a simple substitution cipher that replaces a letter with the 13th letter after it in the alphabet. Since the alphabet has 26 letters, applying ROT13 twice restores the original text.

No, ROT13 is not intended for security. It provides no actual encryption and is used primarily for obfuscation, such as hiding punchlines or spoilers on internet forums.

Standard ROT13 only shifts alphabetic characters (A-Z and a-z). Numbers, punctuation, and spaces remain unchanged in the output.