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R13

ROT13

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ROT13 applies the ROT13 substitution cipher — shifting every letter 13 positions in the alphabet (A→N, N→A) while leaving numbers, spaces, and punctuation unchanged. Since ROT13 is its own inverse, applying it twice returns the original text. Widely used on forums to hide spoilers, puzzle answers, and off-topic content. Type any text and the result appears instantly. Runs in your browser.

Related: MorseBase64 EncodeText → Hex

What is ROT13?

ROT13 is a simple substitution cipher that replaces each letter with the letter 13 positions later in the alphabet. Because the alphabet has 26 letters, applying ROT13 twice returns the original text — encoding and decoding use the same operation. Non-alphabetic characters (digits, punctuation, spaces) pass through unchanged.