Atbash Cipher

Apply the Atbash substitution cipher, which mirrors the alphabet (A↔Z). The same action encodes and decodes.

100% client-side · nothing is uploaded

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How to use the Atbash

Type or paste your text into the Input box.
The converted result appears automatically in the output area — no button to press.
Review the output, then click Copy to copy it to your clipboard.
Edit the input at any time and the result updates live.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Atbash

What is Atbash

Atbash reverses the alphabet: A becomes Z, B becomes Y, and so on. Originally used for the Hebrew alphabet.

Self-inverse

Because the mapping is symmetric, applying Atbash twice returns the original text — one button does both.

Uses

Puzzles, ciphers in games and teaching substitution ciphers.

Frequently asked questions

Is Atbash secure?

No — it's a simple fixed substitution, easily broken.

Do I need a key?

No — Atbash has no key; the mapping is fixed.

Does it change numbers?

No — only letters are transformed.