Atbash Cipher
Self-inverse classical cipher mapping A↔Z, B↔Y, ...
How to Use
- Type or paste your input on the left.
- The result appears live on the right - no buttons needed.
- Copy the output with one click.
About this codec
Self-inverse classical cipher mapping A↔Z, B↔Y, ...
About Atbash
Atbash is a self-inverse substitution cipher mapping A↔Z, B↔Y, and so on. This tool lets you transform text with Atbash instantly and entirely in your browser. It is commonly used for puzzle hunts and learning classical ciphers.
HELLO → SVOOLHow to use it
Type or paste your text into the box and it turns into Atbash live as you type — everything runs locally in your browser. Learn more in the Knowledge Base.
Frequently Asked Questions
Does this leave my browser?
No - the conversion runs entirely in JavaScript on this page.
What does Atbash look like?
HELLO becomes SVOOL. Atbash is typically used for puzzle hunts and learning classical ciphers.
Does my text leave my browser?
No. The Atbash conversion runs entirely in JavaScript on this page — nothing is uploaded, and it works offline.
Is Atbash secure?
No — Atbash is a classical cipher that is easy to break. Use it for puzzles and learning, and use real encryption when you actually need confidentiality.
Common Use Cases
Puzzle hunts and learning classical ciphers
Atbash is commonly used for puzzle hunts and learning classical ciphers — produce it here in one step.
Learning & puzzles
See how text maps to Atbash — handy for coursework, CTF challenges, and puzzle hunts.
Private by design
Everything runs locally in your browser, so you can paste sensitive text without it leaving your device.
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