Generate random numeric PIN codes at whatever length you need. PINs guard phones, cards, locks and app screens, and people tend to reuse birthdays or obvious sequences, which are exactly the codes an attacker tries first. This generator produces genuinely random digits using the browser secure random source, so there is no pattern to guess. Choose the length, from a standard four digits up to a longer code, and generate one or a whole batch at once when you need to hand out several. Each PIN copies with a single click. Because everything is computed locally and nothing is transmitted, the codes you create never leave your device, which is exactly what you want from something meant to stay secret.