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ROT13 Encoder
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.
Input
ROT13 output
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Frequently Asked Questions
Quick answers to common questions
What is ROT13?+
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.
Is ROT13 secure encryption?+
No. ROT13 is not encryption — it is a trivial obfuscation used for hiding spoilers or puzzle answers. Do not use it for sensitive data.
Does it affect numbers and symbols?+
No. Only A–Z and a–z are rotated. Numbers, spaces, and punctuation remain unchanged.