Encode or decode text with the ROT13 cipher. Symmetric operation — the same transform encodes and decodes.
ROT13 is symmetric — encoding and decoding use the same operation.
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Quick answers to common questions
ROT13 (rotate by 13) shifts each letter 13 positions in the alphabet. Because the alphabet has 26 letters, applying ROT13 twice returns the original text.
No. ROT13 is not encryption — it is a trivial obfuscation used for hiding spoilers or puzzle answers. Do not use it for sensitive data.
No. Only A–Z and a–z are rotated. Numbers, spaces, and punctuation remain unchanged.
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