Atbash cipher encoder and decoder
The Atbash cipher swaps each letter for its mirror image in the alphabet: A↔Z, B↔Y, C↔X, and so on. It is one of the oldest known substitution ciphers and is its own inverse — the same operation both encrypts and decrypts.
Type your text and the mirrored output appears instantly. Digits, spaces and punctuation are left untouched, and everything runs in your browser.