Beaufort Cipher (Encode & Decode)
Security ToolsReciprocal Vigenère variant using a repeating key
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All history →Beaufort Cipher (Encode & Decode) — at a glance
Run a message through the Beaufort cipher with one keyword.
How to use it — step by step
Your text and a keyword. Only letters change; spaces and punctuation stay.
Add your text
Paste or type your input into the box. The Sample button fills in an example.
Choose the options
Pick the mode and settings you need. Results update when you run the tool again.
Press Apply Beaufort
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
How is Beaufort different from Vigenère?+
Vigenère adds the key letter. Beaufort subtracts the text letter from the key letter, which makes it its own reverse.
How do I decode?+
Paste the coded text with the same keyword and press the button again.
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.