ROT13 Encoder/Decoder
ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. Encoding and decoding use the same algorithm.
Input Text
Output Text
About ROT13
ROT13 is a special case of the Caesar cipher which was developed in ancient Rome. Because there are 26 letters in the English alphabet, applying ROT13 twice returns the original text, making it its own inverse.
Examples:
- "HELLO" encodes to "URYYB"
- "SECRET" encodes to "FRPERG"
- "ROT13" encodes to "EBG13"
ROT13 is commonly used in online forums to hide spoilers, punchlines, and offensive material.
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