ROT13 Cipher
Encrypt or decrypt text by rotating letters 13 places (A ↔ N).
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Examples
Hello World
Basic ROT13 example showing how 'Hello World' becomes 'Uryyb Jbeyq'.
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Quick Brown Fox
A pangram demonstrating full alphabet ROT13 rotation.
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Numbers & Symbols
ROT13 only affects letters; numbers and symbols remain unchanged.
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Double ROT13
Applying ROT13 twice returns the original text -- try it yourself!
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About ROT13
ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. It is a special case of the Caesar cipher which was developed in ancient Rome.
Self-Reversible
Fast Encryption
Works Offline