Random Number Generator

The Random Number Generator produces random whole numbers within a range you choose, with an option to generate multiple unique (non-repeating) numbers at once. Under the hood the generator uses JavaScript's built-in Math.random() (not the Web Crypto API), so with duplicates allowed each value is simply min + Math.floor(Math.random() × rangeSize) drawn independently — fine for games, raffles, and everyday decisions, but not for anything security-sensitive. When duplicates are disallowed, it doesn't retry-until-unique; it builds the entire range as an array, runs a Fisher–Yates shuffle, and returns the first N values, so unique draws stay perfectly uniform and always succeed as long as the count doesn't exceed the range size — if it does, the tool throws an explicit error rather than silently truncating the list.