Cryptic scrambles and unscrambles text with the classic pen-and-paper ciphers — Caesar shift, ROT13, Atbash and Vigenère. Great for puzzles, learning how ciphers work, or a bit of light fun. These are historical ciphers, not real security. Nothing is uploaded.

Cipher

Shift

Input

Output

Only letters A–Z are changed; digits, spaces and punctuation pass through untouched, and letter case is kept. ROT13 and Atbash are their own inverse, so encode and decode do the same thing. These ciphers are trivially broken and are here for fun and learning, not to protect anything real. Everything runs on your device.