What is a random number generator?
A random number generator picks a number at random within the range you set. It is the most versatile tool for any number-based draw: you define a minimum and a maximum and get an unpredictable value within that interval, with the same probability for every number.
It works just as well for picking a number from 1 to 100 as for drawing among hundreds of numbered participants.
When to use the number generator?
- Numbered draws: assign a number to each participant and pick the winner.
- Guess-the-number games among friends or in class.
- Choosing at random a page, a row or a position in a list.
- Raffles and home lotteries with numbered tickets.
How does our generator work?
You set the range (minimum and maximum) and, when you generate, the page uses the browser’s Math.random() function to produce a number within that interval. Every number in the range is equally likely and each generation is independent of the last.
The computation happens entirely in your browser, with nothing sent to a server.
What does "random" mean on a computer?
Computers don't improvise: they follow instructions. So when we talk about "random" numbers on a website, they're really pseudo-random: an algorithm starts from an initial value and produces a sequence so unpredictable and evenly spread that, for any everyday use, it behaves just like pure chance. The browser's Math.random() function is designed for exactly this and spreads results uniformly across the whole range. For a draw among friends, picking a number from 1 to 100 or deciding who starts, it's more than enough. The only thing it isn't suited for is cryptography or draws with legal value, where specialized, certified generators are used.
Frequently asked questions
Can I choose the number range?
Yes. You set the minimum and maximum, and the result is always within that interval.
Do all numbers have the same probability?
Yes, within the chosen range every number is equally likely.
Is it valid for draws with legal value?
It is ideal for casual use, but it is not cryptographically secure; use a certified service for official draws.
Can it repeat the same number?
Yes. Each generation is independent, so a number can come up several times in a row.
How do I draw several numbers without repeats?
This tool generates each number independently, so it can repeat. If you need several distinct ones (for example, the winners of a raffle), note down each result and generate again, discarding any that have already come up, or use the name draw, which works on a list without repeats.
Can I generate negative or very large numbers?
Yes. The range accepts any minimum and maximum you want, including negative numbers. Just make sure the minimum is lower than the maximum so there's a valid interval.
What is a random number used for besides draws?
For lots of things: picking a question from a list, deciding turn order, assigning seats, drawing a random exercise in class, or even for homemade board games when you don't have dice handy.