Atbash Cipher (Encode & Decode)
Security ToolsMirror the alphabet: A becomes Z, B becomes Y
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All history →Atbash Cipher (Encode & Decode) — at a glance
Turn any message into Atbash code, or decode one, in a single tap.
How to use it — step by step
Any text. Letters are swapped with their mirror letter; numbers and symbols stay as they are.
Add your text
Paste or type your input into the box. The Sample button fills in an example.
Press Apply Atbash
The result is made instantly inside your browser.
Copy the result
Use the Copy button, or send it to another tool.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
Is Atbash secure?+
No. It is a very old, fixed substitution and is easy to break. Use it for puzzles and learning.
How do I decode Atbash?+
Paste the code and press Run. Encoding and decoding are the same step.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.