Atbash Cipher — Free Online Tool

Encode text using the Atbash mirror substitution cipher. Atbash Cipher is a free online tool from the ToolsRift Encoders & Decoders collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

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How to use Atbash Cipher

  1. Open the Atbash Cipher above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

What is the Atbash cipher?

A substitution cipher where each letter is mapped to its mirror: A→Z, B→Y, ..., Z→A.

Is it symmetric?

Yes — encoding and decoding use the exact same operation. Apply it twice to get the original.

Where did Atbash originate?

Ancient Hebrew cryptography. 'Atbash' itself encodes the first and last Hebrew letters: Aleph-Tav-Bet-Shin.

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