What does Atbash Cipher do?

Use the Atbash Cipher tool to reverse the alphabet for simple substitution encoding, decoding, puzzle creation, history lessons, and cipher experiments.

Is Atbash Cipher free to use?

Yes. Atbash Cipher is a free browser-based text utility that runs entirely on your device; nothing is sent to any server.

Atbash Cipher

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Atbash Cipher

Reverse the alphabet for simple substitution.

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About

The Atbash Cipher tool encodes and decodes text using a simple substitution method that maps the alphabet in reverse—A becomes Z, B becomes Y, C becomes X, and so on. This ancient cipher dates back thousands of years and is one of the easiest ways to explore classical encryption techniques. Despite its simplicity, Atbash remains popular in puzzles, historical studies, and educational environments. The tool processes everything instantly in your browser without storing or sending your text anywhere, making it completely private. It supports uppercase and lowercase letters and preserves numbers and punctuation exactly as written. Atbash is often used to obfuscate text lightly, create themed cipher messages, or teach beginners how substitution ciphers work. This tool offers a fast, accurate, and enjoyable way to experiment with one of history’s earliest encryption systems.

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