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Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

Atbash Cipher Encoder / Decoder

Reverse the alphabet to encode or decode text with Atbash.

FreeRuns in browseratbash cipheratbash decoder

Atbash mirrors the alphabet: A becomes Z, B becomes Y, and so on.

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Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About Atbash Cipher Encoder / Decoder

Reverse the alphabet to encode or decode text with Atbash. Encode and decode text with the Atbash cipher online for free. Reverses the alphabet so A becomes Z and B becomes Y. Instant symmetric transformation. Implements standard encoding and decoding algorithms that produce output compatible with all major programming languages and platforms. Supports both encoding and decoding in a single interface. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: Caesar Cipher Encoder / Decoder, Vigenere Cipher Encoder / Decoder, Rail Fence Cipher Encoder / Decoder

How to Use Atbash Cipher Encoder / Decoder

  1. Enter text or data in the input field.
  2. Click Encode or Decode depending on your goal.
  3. Copy the output to your clipboard.

Frequently Asked Questions

What is Atbash Cipher Encoder / Decoder?
Encode and decode text with the Atbash cipher online for free. Reverses the alphabet so A becomes Z and B becomes Y. Instant symmetric transformation.
What encoding standards are used?
This tool follows the official encoding specifications, including RFC standards where applicable. The implementation matches widely-used libraries so the output is compatible with other systems and programming languages.
Can I encode binary data?
The tool primarily handles text input, but many encoding formats such as Base64 are designed to represent binary data as text. You can paste Base64-encoded binary data for decoding or encode text into a binary-safe format.
Is the encoding reversible?
Yes, all encoding operations provided by this tool are fully reversible. You can encode text and then decode it back to get the exact original content without any data loss.
Is Atbash Cipher Encoder / Decoder free to use?
Yes, encoding and decoding are completely free with no usage limits. The tool runs in your browser and requires no registration.
Is my data safe when using Atbash Cipher Encoder / Decoder?
Yes, all encoding and decoding happens locally in your browser. No data leaves your device, so your input remains completely private.

Related Tools

Caesar Cipher Encoder / Decoder
Shift letters by a fixed number to encode or decode text.
Vigenere Cipher Encoder / Decoder
Encode and decode text using the Vigenere polyalphabetic cipher.
Rail Fence Cipher Encoder / Decoder
Encode and decode text using the rail fence transposition cipher.