Why this tool is useful
Use Atbash to demonstrate a fixed monoalphabetic substitution or decode an existing Atbash exercise without entering a key.
Text & List Tools · runs locally
Atbash Cipher Tool
Apply the reciprocal A-to-Z Atbash substitution to Latin text while preserving case, spaces and punctuation locally.
Ready. Your working data stays in this browser.
How it works
Every ASCII Latin letter is mirrored across the alphabet: A exchanges with Z, B with Y and so on; applying the same operation twice restores the input.
Practical example
Hello, World! becomes Svool, Dliow!, including unchanged comma, space and exclamation mark characters.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.