Shuffle your lines into a random order using a proper Fisher–Yates shuffle, so every arrangement is equally likely.
alice bob carol dave erin
alice carol dave bob erin
Press the Shuffle button again — each press produces a fresh random order.
No. This tool runs entirely in your browser — nothing you type or paste is uploaded, logged or stored anywhere.
There is no fixed limit. Very large documents depend on your device’s memory, but ordinary pages and files are handled instantly.