Random Number & Code Generator

How this random number generator works

Set a minimum, a maximum and how many numbers you need, then press Generate. Each value is drawn with your browser's crypto.getRandomValues — the same source that backs secure keys — using rejection sampling so every number in the range is equally likely. Naïve generators reuse a raw draw with a single modulo, which quietly makes the lowest few numbers more common; discarding the short out-of-band tail removes that bias entirely.

Unique draws, sorting and presets

Tick No repeats for a draw where no value appears twice — you then cannot request more numbers than the range contains. Sort ascending orders the result, which is handy for lottery tickets and sampling. The presets are shortcuts: Dice gives one number from 1–6, Coin flip returns Heads or Tails, and Loto 6/49 draws six unique numbers from 1 to 49, sorted.

Random codes and strings

Switch to Codes mode to generate random codes instead of numbers — coupon and voucher codes, PINs, short IDs or throwaway strings. Choose the length and tick which character types to mix in: uppercase, lowercase, digits and symbols. The PIN, Voucher and Short code presets are one-click starting points, and No look-alikes drops confusable characters like O/0 and I/l/1 so a printed or dictated code is never misread. Each character is picked with the same bias-free crypto draw used for the numbers.

Random vs. cryptographically secure

This tool is not seedable: there is no way to reproduce a past sequence, which is exactly what you want for passwords, tokens, raffles and fair draws. If you instead need a repeatable pseudo-random sequence for a simulation or a unit test, use a seeded PRNG in your own code — a client-side web tool cannot offer reproducibility and unpredictability at the same time.