Atbash Cipher
Swap each letter with its mirror in the alphabet: A becomes Z and B becomes Y. Latin and Hebrew alphabets, with the mapping table. Free and private.
This is not secure encryption: anyone can break it. Use AES encryption for real secrets.
Shortcuts: Ctrl+Enter run · Ctrl+Shift+C copy result · / search (use ⌘ on Mac)
Next steps
Done here? Use the Send to… menu on the result to carry it on to Caesar Cipher.
Free Atbash Cipher
Atbash reverses the alphabet. It is one of the oldest ciphers, first used with the Hebrew alphabet. It gives developers a quick browser-based way to solve a focused atbash cipher task before moving the result into a project.
How to use Atbash Cipher
Type your text. The same step encodes and decodes. The table shows every letter pair.
Common mistakes
- Mixing alphabets: Latin letters are not changed in Hebrew mode.
- Expecting numbers to change: only letters do.
Frequently asked questions
Where does the name come from?
Atbash is the first, last, second and second-last Hebrew letters: aleph-taw-beth-shin.
Do I need a different step to decode?
No. A becomes Z and Z becomes A, so applying it twice gives the original.
Is it secure?
No. There is no key, so anyone who knows the method can read it.
Is anything uploaded?
No. The calculation runs in your browser and nothing you enter is sent to a server.
How do I use this atbash cipher tool?
Use the interactive controls above; processing stays in your browser and the result is intended as a practical starting point for development work.
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