Encode/Decode ROT13

Simple substitution cipher that replaces a letter with the 13th letter after it.

Input Text

Result

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The Methodology

char + 13 (mod 26)

This tool uses the verified professional formula shown above. We cite our sources so you can trust every result.

How it works

ROT13 ("rotate by 13 places") replaces each letter in the alphabet with the one 13 positions later. Because there are 26 letters in the English alphabet, ROT13 is its own inverse.