Rotation Encryption

Enter text and choose a rotation. The result is computed in your browser as you type — nothing is sent to a server.

Rotational ciphers

Rotation ciphers have a long history. The best-known example is the Caesar cipher (also Caesar's code or Caesar's shift): a substitution cipher that encodes a message by replacing each letter with one a fixed number of positions further along the alphabet.

Applying ROT13 twice shifts by 26, which returns the original text — the same as no encryption at all. This is sometimes jokingly called 2ROT13 or ROT26.

Decrypting a rotationally encrypted message needs no key; it only needs the knowledge that a rotation was used. To reverse ROTn, apply ROT(26−n). ROT13 is its own inverse.

Interesting words in ROT13