ROT13 Encoder / Decoder
ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. Type below to instantly encode or decode.
About ROT13
ROT13 ("rotate by 13 places") is a special case of the Caesar cipher, first described in ancient Rome. Because the alphabet has 26 letters, applying ROT13 twice returns the original text, making it its own inverse. ROT13 is not a secure encryption method — it is used for fun puzzles, hiding spoilers, and obfuscating text in online forums.