ROT13 is a simple letter-substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Because the alphabet has 26 letters, applying ROT13 twice returns the original text — making encoding and decoding the same operation. Non-letter characters are left unchanged.
Type or paste your text and see the ROT13 result live. Apply it again to decode. For proper encryption with a configurable shift, try the Caesar Cipher.
Encode
Input
Hello World
Output
Uryyb Jbeyq
Encrypt and decrypt text using the Caesar (ROT-N) substitution cipher.
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