Random Number Generator

Generate random numbers in any range, unique or repeating.

Minimum

Maximum

How many10

Decimal places0

No repeats

For draws and lotteries. Only available for whole numbers.

Sort ascending

What does Random Number Generator do?

Generate random integers or decimals within a range you set, with an option to force unique values for draws and lotteries. Randomness comes from the browser’s cryptographic source, so results are genuinely unpredictable.

How to Use Random Number Generator

1
Set the rangeMinimum and maximum, inclusive.
2
Choose how manyOne, or a whole batch.
3
Switch on unique if neededFor draws where no number can repeat.
4
GenerateCopy or download the results.

Key Features

Any minimum and maximum, including negative ranges
Integers or decimals with configurable precision
Unique-values mode with no repeats, for draws and lotteries
Generate up to 1,000 numbers at once
Cryptographically secure and free of modulo bias
Sort, copy or download the results

Frequently Asked Questions

Is this truly random?

It uses crypto.getRandomValues, which draws on the operating system’s entropy pool. That is cryptographically secure pseudo-randomness — unpredictable in practice, and the standard for anything where fairness matters.

What is modulo bias and why does it matter?

Naively taking a random value modulo your range makes low numbers slightly more likely. This generator uses rejection sampling — discarding values in the final partial bucket — so every outcome is exactly equally likely.

Can I use this for a prize draw?

Yes, and the unique-values mode is designed for it. For a formal or regulated draw, follow whatever auditing your rules require — a browser tool cannot provide a verifiable audit trail.

Why does unique mode limit how many I can request?

Because you cannot draw more unique numbers than the range contains. Asking for 100 unique values between 1 and 50 is impossible, and the tool says so rather than looping forever.

Runs in your browser

Values come from crypto.getRandomValues, your browser’s cryptographically secure random source, and are never transmitted or logged. Copy anything you need before closing the tab — it cannot be recovered.

How the rest of the site handles data