Atbash Cipher
Encode and decode text using the Atbash cipher, a simple substitution cipher that reverses the alphabet.
Recommended Books on Cryptography & Ciphers
The Code Book
Simon Singh
Cryptography and Network Security
William Stallings
Applied Cryptography
Bruce Schneier
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How to Use
Enter text
Type or paste the text you want to encode or decode.
See result
The Atbash-transformed output appears instantly below.
Copy output
Click Copy to copy the result to your clipboard.
Use Cases
Simple encoding
"Turn 'HELLO' into 'SVOOL' for a quick cipher puzzle."
Decode a message
"Paste an Atbash-encoded message and instantly see the original text."
Educational
"Learn about classical ciphers and how substitution encryption works."
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Frequently Asked Questions
?What is the Atbash cipher?
It is a substitution cipher where each letter is replaced by its reverse in the alphabet. A becomes Z, B becomes Y, and so on.
?Is the Atbash cipher secure?
No. It is a very simple cipher used for educational purposes and puzzles. It offers no real security.
?Does it work with numbers and symbols?
Numbers, spaces, and symbols are passed through unchanged. Only letters A-Z are transformed.
?How do I decode Atbash?
Just apply the cipher again! Atbash is its own inverse — encoding and decoding are the same operation.