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The Best Free ROT13 Encoder/Decoder
ROT13 is one of the simplest and most well-known encryption ciphers. It replaces each letter with the letter 13 positions after it in the alphabet. Since the English alphabet has 26 letters, applying ROT13 twice returns the original text — making it both an encoder and decoder.
How It Works
A becomes N, B becomes O, and so on. ROT13 is used on forums and websites to hide spoilers, puzzle answers, and mildly obscure text. It provides no real security — it is purely for obfuscation.