Random Number Generator

Pick one number or many, in any range you set, with or without repeats. Draws use your browser's cryptographic random number generator and happen entirely on this page.

Settings

Up to 1,000 per draw.
With no repeats, asking for more numbers than the range holds returns the whole range, shuffled.
Your settings are remembered in this browser. Results are not saved.

Result

Set a range and press Draw.

Private by design. This page has no backend. Draws happen in this tab using your device's own random source and nothing is sent anywhere.

How the draw works

Each number comes from crypto.getRandomValues through rejection sampling, so every value in your range is exactly equally likely — including when the range is not a neat power of two, where a plain modulo would quietly favour the low numbers. Ranges wider than 4 billion use two draws combined into one 53-bit value, which covers every integer JavaScript can represent exactly.

With repeats vs without

The default draws each number independently, so the same number can appear twice — that is what "random" usually means, and what dice do. "No repeats" instead shuffles the range with a partial Fisher–Yates pass and deals out the first however-many: the raffle behaviour, where every prize goes to a different ticket.

What randomness does not mean

A fair draw can still look lumpy. In 100 draws from 1–10 you should expect some number to appear about 12 times and another not at all; that is not a malfunction. The crypto source cannot be predicted from past results, which is exactly what you want for draws and exactly what makes it unsuitable for a practice schedule that needs variety.

Common uses

Raffle and prize draws, picking who presents first, generating test data within bounds, choosing a random page to review, board-game decisions when the dice are missing.

How to use the Random Number Generator

  1. Enter the lowest and highest numbers for your range.
  2. Choose how many numbers you want and whether repeats are allowed.
  3. Generate and copy the result.

Frequently asked questions

Are the numbers truly random?

They come from your browser's cryptographic random number generator and are not a predictable pattern.

Can numbers repeat?

Only if you allow repeats; turn that off to get a unique set within the range.

Can I use negative numbers or decimals?

Yes. The range accepts negative values and decimal steps.