Encoding & Number Bases
Atbash Cipher
Encode and decode text with the Atbash cipher — a mirror of the alphabet.
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What is Atbash?
Atbash is one of the oldest known ciphers, from the Hebrew alphabet. Each letter maps to its mirror (first ↔ last), so the transform is its own inverse.
How it works
Each letter is replaced by the one at position 25 − its position, preserving case; non-letters pass through unchanged.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.