Atbash Cipher Text
Mirror the alphabet — A becomes Z, B becomes Y. Its own inverse.
Atbash Cipher is a free online tool that mirror the alphabet — A becomes Z, B becomes Y. Its own inverse. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Text
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- None — it just works
- Works offline
- Yes, after the first visit
About Atbash Cipher
Atbash reverses the alphabet: A becomes Z, B becomes Y, and so on. It originated as a Hebrew substitution cipher — the name comes from the first, last, second and second-to-last Hebrew letters — and appears in the Book of Jeremiah, where Sheshach is generally read as an Atbash rendering of Babel. Like ROT13 it is its own inverse, and it has no key at all.
How to use it
- Paste the text you want to run through atbash cipher.
- There is nothing to configure — the result updates as you type.
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
Questions
Does Atbash have a key?
No. The mapping is fixed, so anyone who recognizes the cipher can read the message. It is a curiosity and a puzzle device, not a security measure.
Why does it appear in crossword and escape-room puzzles?
Because it is recognizable once you know it and impenetrable until then — the ideal difficulty curve for a puzzle. The giveaway is a high frequency of Z, V and S where E, T and A would normally be.