Instantly encode and decode text using ROT13 format. Our tool shows you exactly how your input transforms through the encoding process, with real examples and explanations suitable for developers, students, and security researchers.
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Open Text Encoder/Decoder →ROT13 is a simple letter substitution cipher that replaces each letter with the one 13 positions after it in the alphabet. Because the English alphabet has 26 letters, applying ROT13 twice returns the original text. ROT13 is commonly used in online forums to hide spoilers and puzzle answers.
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