Free Online Tool
Polybius Square
Convert text using the ancient Polybius square cipher with a 5x5 grid substitution method.
How to Use Polybius Square
- Enter or paste your text in the input field
- Select your desired options (if available)
- Click the encode/decode button or watch real-time conversion
- Copy the result using the copy button
Examples
Input:
Hello World
Output:
Features
Privacy Focused
All processing happens in your browser. No data is sent to servers.
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No registration, no limits, completely free to use.