Number Generator - Random Integers in Any Range

The Number Generator draws random integers inside a chosen minimum and maximum, with a fixed count and an option to allow or forbid repeated values. Set the range and how many numbers to return, and the tool fills the result list instantly using a cryptographically fair random source in the browser.

Random integer generation is the core of raffles, lottery-style picks, classroom exercises, dice simulations and any situation calling for a fair, unpredictable number from a defined range.

Generate random numbers in a range

Enter a minimum, a maximum, and a count, and the Number Generator returns that many integers drawn from the inclusive range between minimum and maximum. Defaults open at 1 through 100 with five values returned.

Minimum and maximum must both be whole numbers, with maximum at least as large as minimum, and count must be a whole number from 1 through 1,000.

Inclusive bounds mean the maximum value itself is reachable in the draw, which matters for a raffle or lottery labeled "1 through 100": the range must be set with maximum at exactly 100, not 99, for the labeling to match the actual draw.

Choose whether repeats are allowed

Setting unique to Yes draws without replacement: the generator builds every integer in the range, shuffles that full pool using a fair shuffle algorithm, and returns the first count entries from the shuffled result. If the requested count exceeds the total size of the range, generation stops with an error rather than silently producing duplicate values.

Setting unique to No allows the same integer to appear more than once across the returned list, since each value drawn is an independent, fresh random pick from the full range. Use unique Yes for raffle tickets, seating assignments or any situation where the same value appearing twice would be a problem. Use unique No for independent repeated rolls of the same range, such as simulating multiple dice throws.

Simulate a die roll or run a raffle

For a single six-sided die face, set minimum to 1, maximum to 6, count to 1, and unique to No; each press of generate returns one independent face.

For two dice that may show doubles, keep unique set to No and set count to 2, so both positions draw independently from the same 1-through-6 range; setting unique to Yes with count 2 would incorrectly forbid doubles, which is not how real dice behave.

For a raffle, set minimum to 1, maximum to the total number of tickets sold, unique to Yes, and count to the number of prizes being awarded. The generator returns that many distinct ticket numbers in shuffle order; the first number listed can be treated as first prize if the prizes are ranked.

Verify the randomness is fair

Numbers come from a cryptographically secure random source built into the browser, which fills a buffer with random bytes and uses rejection sampling to avoid a subtle bias that a naive modulo approach can introduce when the range size does not divide evenly into the random source's range.

This method does not rely on the standard, less rigorous pseudo-random function commonly used for casual purposes.

Every generated value stays local to the browser and is not transmitted anywhere. There is no seed input for this tool, meaning each press produces an entirely fresh, non-reproducible draw rather than a repeatable sequence.

Work through a probability example

Take minimum 1, maximum 10, count 3, with unique set to Yes. The pool contains ten integers. After a fair shuffle, any specific number, such as 7, has a 3-in-10 chance of appearing somewhere among the three drawn values, since three of the ten pool positions are being filled.

With unique set to No instead, each of the three draws is fully independent, so the expected number of times a specific value like 7 appears across three draws is 3 × (1/10) = 0.3, and unlike the unique-Yes case, the same value could in principle appear more than once.

Frequently asked questions

Summary

Generating a random number means setting a minimum, maximum and count, then drawing that many integers from the inclusive range using a cryptographically fair random source, with an option to allow or forbid repeated values.

Unique draws suit raffles and ticket assignments, while non-unique draws suit independent repeated events like dice rolls, and every draw stays local to the browser without a reproducible seed.