Random Number Generator

From raffle draws and classroom questions to testing data and deciding who makes the tea, a fair random number settles arguments instantly. Our free random number generator uses your browser’s cryptographic random source, the same quality of randomness used for security tokens, to pick numbers in any range you set. Generate one number or a hundred, allow repeats or guarantee uniques for lottery-style draws, and sort the results for easy checking against tickets and lists.

Quick Answer: Set a minimum and maximum, choose how many numbers to draw and whether duplicates are allowed, then click Generate. Results use cryptographic randomness for a genuinely fair draw.

Free Online Tool

Cryptographically fair random numbers for draws, games and testing.

Minimum

Maximum

How many numbers

Allow duplicate numbers
Sort results ascending

Table of Contents

How to Use the Random Number Generator

Enter the smallest and largest possible numbers for your draw.
Set how many numbers you want to generate.
Untick 'allow duplicates' for lottery-style draws where each number must be unique (the range must be big enough).
Optionally sort the results ascending to compare them with tickets or lists easily.
Click Generate as many times as you need; every click is a fresh, independent draw.

Key Features

Cryptographically strong randomness via the Web Crypto API, not predictable pseudo-random patterns.
Any range: from 1 to 10 for a dice-like draw, up to millions for IDs and test data.
Duplicate control and optional ascending sort for draw and lottery formats.
Bulk generation of up to 1,000 numbers in one click.
Draw happens locally; no results are stored, logged or shared.

Best Practices and Tips

For a fair public draw, set the range and rules before generating, and generate once; re-rolling until you like the result destroys fairness.
If you need unique numbers, make sure the range size is at least the count requested, or generation is mathematically impossible.
For dice, use two separate 1-to-6 draws rather than one 2-to-12 draw; the distributions are different and real dice favour middle totals.
Save a screenshot of the draw settings alongside the results if the draw needs to be auditable later.

Common Mistakes to Avoid

Asking for 10 unique numbers from a range of 1 to 5 and blaming the tool; the range must contain at least as many values as you request.
Using a random generator for passwords: numbers alone make weak passwords, so use the Strong Password Generator instead.
Treating one surprising result (like the same number twice) as proof of bias; true randomness produces repeats and clusters naturally.

Frequently Asked Questions

How random are these numbers, really?

They come from crypto.getRandomValues, your browser's interface to the operating system's cryptographic random source. That is the same grade of randomness used to generate encryption keys and session tokens, far stronger than the Math.random function simple scripts use.

Can I generate decimal numbers?

This generator produces whole numbers, which is what draws, dice, raffles and sampling need. For decimals, generate a large integer range (for example 0 to 1000) and divide the results by 100 or 1000 as required.

What is the maximum range allowed?

Ranges up to billions work, and you can draw up to 1,000 numbers per click. If duplicates are disallowed, the draw count cannot exceed the number of values in the range.

Is this suitable for official lotteries?

The randomness quality is excellent, but regulated draws also require certified processes, witnesses and audit trails that a web tool cannot provide. Use it for informal draws, games, classrooms and testing.

Why do I sometimes get the same number twice in a row?

Because each draw is independent, repeats are expected occasionally, just as a fair coin can land heads several times in a row. If repeats are a problem for your use case, disable duplicates.