Rangdom

Atbash Cipher

Svool, Izmtwln!
Transformed locally in your browser. Each letter A–Z and a–z maps to its mirror in the alphabet (A↔Z, B↔Y, … M↔N) while case is preserved; digits, punctuation, and spaces pass through unchanged. Atbash is its own inverse, so running the output back through the tool returns the original text.

Encode or decode with Atbash

Atbash is the simplest monoalphabetic substitution: it reverses the alphabet so the first letter becomes the last and vice versa. Because encoding and decoding are the identical operation, there is no key and no mode toggle — paste a message to scramble it or recover it in a single step.

When to use this tool

Reach for the Atbash cipher when a puzzle, CTF challenge, or intro-crypto lesson calls for the classic mirror substitution that maps A to Z, B to Y, and so on. It is the simplest member of the cipher family — self-inverse, so the same single step both scrambles and recovers a message — and a natural complement to the shift-based Caesar cipher and the keyword-based Vigenère cipher.

Privacy and limitations

Everything runs locally in your browser; nothing is sent anywhere. This is a classical cipher, not real encryption — it only mirrors A–Z and a–z, leaves digits, symbols, and non-Latin characters untouched, and has no key or mode toggle because encoding and decoding are the same operation.

Related tools

Caesar CipherVigenère CipherPrivacy PolicyLocal-first privacy guide