Vigenère

Polyalphabetic shift — each letter moves by the matching letter of a repeating key.

Key Letters of this word drive the shift, cycling through the input. Non-letters in the key are ignored.

Input

Output

Visualization

Nothing to visualize yet — type into the input above.

// about

A classical cipher — the kind of thing people used before computers. Fun and educational, but not cryptographically secure. Hit Share link to copy a URL that encodes your current state — recipients open it and their browser reconstructs everything locally. Nothing touches a server.