Atbash Cipher Encoder and Decoder

What is Atbash Cipher Encoder and Decoder

Atbash is one of the oldest known ciphers, originally used for the Hebrew alphabet. It mirrors the alphabet: A swaps with Z, B with Y, and so on down the middle. Because the mapping is symmetric, running it twice returns the original text, so the same tool encodes and decodes. Case is preserved and digits, spaces, and punctuation stay unchanged. It runs entirely in your browser.

How to use

1. Type or paste your text.
2. Read the Atbash result, updated as you type.
3. Paste Atbash text to decode it: the same mirror reverses it.
4. Copy the result or share the link with your text filled in.

When to use it

Working a CTF challenge or a puzzle that looks like nonsense with reversed-looking letters? Atbash is a common first guess, turning 'Hello' into 'Svool'. Since it is its own inverse, paste the scrambled text into the same box to read it back. There is no key to remember, which is exactly why it shows up in beginner ciphers and escape rooms.

Frequently asked questions