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Atbash Cipher

Mirror the alphabet so A becomes Z and Z becomes A, keeping case exactly as written.

Atbash cipher

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Atbash is its own inverse, so encoding an already encoded message gives the original text back again.

How to use the Atbash Cipher

  1. Type or paste the message you want to mirror.
  2. Choose encode to scramble it or decode to read it back.
  3. Copy the mirrored text with the Copy button.

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Frequently Asked Questions

Common questions about the free online atbash cipher.

Atbash is an ancient substitution cipher that reverses the alphabet, so the first letter becomes the last, the second the second last, and so on.
Run the text through the same tool again. Atbash is its own inverse, so the second pass always returns the original message.
No. It has no key and only one possible mapping, so anyone who recognises it can decode it in seconds. It is a puzzle device, not encryption.
Yes. Capital letters map to capital letters and lowercase letters map to lowercase letters, so the shape of the original text is preserved.
They pass through untouched. Only the twenty six letters of the alphabet are mirrored, so numbers, spaces and symbols stay where they are.
The name comes from the Hebrew alphabet, where Aleph, Tav, Beth and Shin were paired as first with last and second with second last.
No. Everything is mirrored in your browser, so nothing you type is sent anywhere and nothing is saved.
Yes. The tool is completely free, works on any modern browser, and has no limits, no account and no sign-up.

Last updated: October 10, 2026