Random Number Generator

What is a random number generator?

A random number generator is a tool that produces numbers you could not predict in advance — the digital equivalent of drawing a number from a hat, only faster and with a much bigger hat. People reach for one to pick a random number between 1 and 100 for a raffle, to settle an argument about who goes first, to seed a spreadsheet with test data, or simply because rolling actual dice for a hundred trials would take all afternoon. Whether you call it a random number generator, a random number picker, or just a way to pick a random number, the job is the same: hand you a number you had no way of guessing.

This one runs as a random number generator you use directly in your browser tab. Set a minimum and a maximum — any whole numbers from -1,000,000,000 to 1,000,000,000, negatives included — and it draws from that range. You can pull a single number or up to a thousand at once, with or without repeats, and nothing you type or generate ever leaves your device.

How to use it

1. Enter your minimum and maximum. Type the lowest and highest numbers you want in the draw into the Minimum and Maximum fields — whole numbers only, and negatives are fine if you need a range like -50 to 50.
2. Set how many numbers you want, and whether repeats are allowed. Use the How many field to ask for anywhere from 1 to 1000 numbers in one go, and tick No repeats if every number in the draw needs to be different, like a raffle where the same ticket cannot win twice.
3. Generate your numbers, then copy them. Press Generate numbers to draw — the button turns into Draw again so you can pull a fresh set with the same settings — and use Copy all to grab every result from the grid at once.

Where the randomness actually comes from

Most random numbers on the web come from Math.random(), a fast general-purpose generator built for things like shuffling which image loads first. It has no security guarantee: given a handful of its outputs, its internal state can be reconstructed and every number it produces after that becomes predictable. That is a fine trade-off for a shuffle nobody cares about and a bad one for a draw someone might argue over. This tool instead pulls from your browser's cryptographic random source, crypto.getRandomValues, the same kind of generator used to create encryption keys — designed from the ground up so past outputs reveal nothing about future ones.

Getting the raw random bits onto your chosen range also has to be done carefully. The obvious shortcut — take a random byte and reduce it by your range using a remainder — quietly skews the results whenever your range does not divide evenly into 256. Draw a number from 1 to 100 that way and 1 through 56 come up about half again as often as 57 through 100, purely because of the arithmetic, not bad luck. This tool avoids that by using rejection sampling: it throws away any raw value that would cause the skew and draws again, so every number in your range ends up exactly equally likely. Both the modulo bias and the fix were verified by testing before this page was written, not just assumed to work.

What this tool cannot do

Nothing you generate here is logged or saved anywhere — that is good for your privacy and bad if you ever need to prove what happened. There is no record you can point to after the fact. If you are running a public giveaway or settling a dispute where someone might question the result, draw it on camera, or use a service that publishes a signed, verifiable record of each draw, like random.org.

This tool also is not certified for gambling or official lotteries — those require audited hardware generators and regulatory sign-off that a browser tool cannot provide. It is built for games, classroom exercises, giveaways, sampling, splitting chores, and everyday decisions.

A few other limits worth knowing: it only produces whole numbers, never decimals; with No repeats ticked you cannot draw more numbers than your range holds, so asking for 10 unique numbers between 1 and 5 will hand you back only 5; and results disappear the moment you reload the page.

Why is it free?

It runs entirely in your browser, so there is no server cost per draw to recoup — no account to create, no watermark on your results, and no paid tier hiding features like No repeats or the 1000-number cap behind a paywall. That is the same reason every tool on FreeToGenerate.com works this way.