How to Generate Random Numbers Online (Free)

Need a fair random number — for a raffle, a sample, a game, or a quick decision? Picking one in your head is not actually random, and rolling dice only goes so far. This guide shows you how to generate random numbers for free with the Random Number Generator. Set any range, get one number or many, and turn off repeats for a draw. It uses your browser's secure random source and runs entirely on your device.

How random number generation works

A random number generator produces numbers with no predictable pattern. This tool uses your browser's cryptographic random source, which draws on high-quality randomness from your device — far better than a simple, predictable formula.

You control the boundaries. You set a minimum and maximum, and every number in that inclusive range has an equal chance of being chosen. You can ask for a single number or a whole batch at once. Turning on no repeats makes the tool behave like drawing tickets from a hat: once a number is picked, it will not come up again in that batch.

How to use the Random Number Generator

It takes just a moment:

1. Open the Random Number Generator.
2. Enter the minimum and maximum of your range.
3. Choose how many numbers you want to generate.
4. Turn on the no repeats option if each number should be unique.
5. Click generate, then copy the result.

The numbers appear instantly, and you can generate again as many times as you like.

Example: ranges and outputs

Here are some typical setups and what they produce:

With no repeats off, the same number can appear twice in a batch; with it on, every number in the batch is unique.

Common use cases

Random numbers are useful in lots of situations:

• Picking raffle or lottery numbers fairly.
• Choosing a winner by assigning each entrant a number.
• Selecting a random sample for a survey or test.
• Generating game values, dice rolls or random stats.
• Making an unbiased decision when you cannot choose.

If you want to pick from a list of names rather than numbers, use the Random Picker. For tabletop dice specifically, the Dice Roller is a quick option.

Tips and common mistakes

A few things to remember:

• The range is inclusive, so 1 to 100 can return both 1 and 100.
• If you need unique numbers, turn on no repeats — otherwise duplicates are expected and fair.
• You cannot request more unique numbers than the range holds; asking for 20 unique numbers from 1 to 10 is impossible.
• For true fairness in a draw, set the range and count once and generate a single time rather than re-rolling until you like the result.

The common mistake is re-generating repeatedly to get a preferred outcome, which defeats the point of randomness.

Is it private and free

Yes. The Random Number Generator runs entirely in your browser using its built-in secure random source, so nothing is uploaded and results are instant. It is free with no sign-up and no limits.

For more handy utilities, browse the developer tools category or the full all tools list. Related tools include the Random Picker and the Dice Roller.