Random Number Generator
Generate random numbers within a range you define, in any quantity, with optional no-repeat mode for draws and a decimal mode with a configurable number of decimal places.
FreeOnline Tool
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How to Use
- Set the minimum and maximum of the range.
- Enter how many numbers you want to generate.
- Decide whether repeats are allowed (for a draw, no repeats is the usual choice).
- Click Generate and the results appear immediately.
- Click again to regenerate as often as you like, or click Copy to copy every result.
Features
- Custom numeric range, including negative values and large ranges.
- Set the quantity to generate several random numbers at once.
- No-repeat mode for draws and lotteries.
- Random decimals with a configurable number of decimal places.
- Every click produces a fresh set of results.
Use Cases
Dividing a team into groups
Set the range from 1 to the number of people and generate numbers without repeats to randomly group or order participants.
Drawing prize numbers
Generate winning numbers for an event with the range set to the span of participant IDs, keeping the draw fair.
Generating test data
Produce large batches of random numbers as test case input to check how a program behaves across different values.
Random events in games
Simulate dice rolls and random events in board games or programming exercises instead of using physical dice.
FAQ
Are the numbers truly random or pseudorandom?
They come from the browser's Math.random(), which makes them pseudorandom. That is fine for everyday uses such as draws and test data, but if you need cryptographic-grade randomness, use a dedicated tool instead.
Can I generate numbers with no repeats?
Yes. Turn on the no-repeat option and every generated number will be distinct. Note that the quantity cannot exceed how many numbers the range contains.
Can it generate random decimals?
Yes. Choose decimal mode and set the number of decimal places to get random floating-point numbers at that precision.
How large can the range be?
Any integer range within JavaScript's safe integer limits (plus or minus 2 to the 53rd power), which covers almost every practical need.