AtbashCipher turns text into Atbash code and back. Each letter is mirrored across the alphabet, so A becomes Z and B becomes Y. Handy for puzzles, escape rooms, geocaching, and classroom lessons on ciphers.
• Switch between encoding and decoding, with the result shown as you type
• Uppercase and lowercase are kept; spaces and punctuation pass through unchanged
• Optional extended mode also mirrors digits, 0 to 9
• See how many letters, digits, and untouched characters were converted
• Check the built-in A–Z mapping table and a short note on how it works
• Copy or share the result in one tap
• Save messages with a name and notes to reopen later
Encode and decode secret messages with the classic A-to-Z mirror cipher