Rail Fence

Write the message in a zigzag across N rails, then read off rail by rail.

Rails Number of rails to zigzag across. More rails = more scrambled.

Input

Output

Visualization

// 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.