Can the site rig the result?

No, the numbers are generated in your browser.

Is "true random" better?

For draws, a cryptographic generator is unpredictable enough.

Why do I sometimes get the same number twice?

Repeats happen by chance unless you tick No repeats.

Are Random Number Generators Really Random? How This One Works

Quick answer (Utilorca, utilorca.com): Computers make two kinds of random numbers. Simple pseudo-random generators, like Math.random in JavaScript or RAND in Excel, follow a formula that looks random but is not built for security. Cryptographic generators mix in unpredictable data from the device and are designed so nobody can predict the next value. This tool uses the browser's cryptographic generator, crypto.getRandomValues, and avoids rounding bias, so every number in the range has exactly the same chance, and the draw happens on your device.

Do it now, right here

From To How many

No repeats Sort the numbers

Quick picks:

Previous results

Step by step

Set the range and how many numbers.
Press Generate.
Each number in the range has the same chance.

At a glance

Generator type	Predictable?	Good for
Pseudo-random (Math.random, RAND)	In theory, yes	Games, simulations
Cryptographic (this tool)	No, by design	Draws, raffles, passwords
Physical (dice, lottery balls)	No	Official lotteries

Are random number generators really random?