Is a random number generator actually fair?

Yes. A good one gives every number in your range an equal chance with no memory between picks, so a number is never "due." Its pseudo-random source is fair enough for draws and games, just not for security.

How do I pick multiple winners without repeats?

Turn on the no-repeats option, or remove each drawn number before the next, so nobody is picked twice. For a single decision, one number is enough; for sampling, bulk generation is faster.

What can I use a random number generator for?

Raffles and giveaways, choosing who goes first, sampling rows from data, seeding games, settling arguments, and generating test data: anything that needs an impartial number within a set range.

Random Number Generator: Fair Picks for Draws, Games, and Code

One Tool, Endless Uses

A random number generator is one of those deceptively simple tools that solves a surprising range of problems. Pick a winner, choose who goes first, sample a row from a spreadsheet, seed a game, settle an argument: anything that needs an impartial number within a range is a job for it. Set a minimum and maximum, generate, and you have a result instantly.

The value is impartiality you can demonstrate. When you pull a number in front of people rather than choosing one yourself, nobody can claim you steered it, which is exactly what you want for a draw or a decision with anything at stake.

What "Random" Really Means

A good generator gives every number in your range an equal chance, with no memory between picks, so a six is never "due" because it has not come up in a while (believing otherwise is the gambler's fallacy). That independence is the whole point: each draw stands alone, so streaks happen naturally and mean nothing, just like a fair coin landing heads several times running.

Set the range to match the job exactly. For a raffle of 200 tickets, generate from 1 to 200; for a dice-like roll, 1 to 6. Generating more numbers than you need and discarding some is fine too, as long as every number had its fair shot. Drawing names instead? A random name picker skips the numbering step.

Single Picks and Bulk Draws

For one decision, a single number is all you need. For sampling or multiple winners, generate a batch and switch on the no-repeats option so nobody is picked twice; the bulk random number generator has the same unique mode, and a random number in range generator adds decimals. Bulk generation also seeds test data and fills spreadsheets quickly.

These generators run in your browser on JavaScript's built-in pseudo-random source, Math.random(), and send nothing anywhere. That is fine for raffles, games and sampling, but not for passwords or keys, because it is not cryptographically secure. Set your range, pick single or bulk, and let the impartiality do the work.

Frequently asked questions

Is a random number generator actually fair?: Yes. A good one gives every number in your range an equal chance with no memory between picks, so a number is never "due." Its pseudo-random source is fair enough for draws and games, just not for security.
How do I pick multiple winners without repeats?: Turn on the no-repeats option, or remove each drawn number before the next, so nobody is picked twice. For a single decision, one number is enough; for sampling, bulk generation is faster.
What can I use a random number generator for?: Raffles and giveaways, choosing who goes first, sampling rows from data, seeding games, settling arguments, and generating test data: anything that needs an impartial number within a set range.

Sources

Math.random() — MDN Web Docs
Gambler's fallacy — Wikipedia