Atbash Cipher Encoder
Apply the reversible Atbash substitution that mirrors A-Z and a-z while leaving other characters unchanged.
Description
Apply the reversible A-to-Z and a-to-z mirror substitution while preserving nonletters.
Atbash Cipher Encoder apply the reversible A-to-Z and a-to-z mirror substitution while preserving nonletters.
Use this for puzzles, demonstrations of monoalphabetic substitution, and reversible text transformations that require no key.
When to use Atbash Cipher Encoder
Use this for puzzles, demonstrations of monoalphabetic substitution, and reversible text transformations that require no key.
How it works
Uppercase and lowercase English letters are mirrored independently: A maps to Z, B to Y, and so on. Applying the operation twice restores the input.
Interpreting the result
Keep the input units, direction conventions, encoding, and ordering rules visible when reusing the result. Preserve the full returned value for downstream calculations and round only for presentation.
Assumptions and limitations
Atbash provides no modern confidentiality or authenticity. Characters outside ASCII A-Z and a-z are deliberately left unchanged.