Random Number Generator

Generate truly even random numbers within any range, with optional uniqueness.

Random Number Generator

Cryptographically secure randomness

Min

Max

Count

No duplicates

Set your range and count, then click Generate — your random numbers will appear here.

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Quick Answer

Random Number Generator computes generate truly even random numbers within any range, with optional uniqueness. Formula: uniform integer in [min, max] via the browser's cryptographically secure randomness source. Example: Rolling a die: min 1, max 5.

How to Use This Calculator

1Set the lowest possible value for the range, defined as the minimum, before generating numbers.
2Set the highest possible value for the range, defined as the maximum, to bound the generation.
3Choose how many numbers to generate and whether repeats are allowed.
4Press Generate — each press produces a fresh set.

Formula Used

uniform integer in [min, max] via the browser's cryptographically secure randomness source

Each number is drawn uniformly from your chosen range, meaning every integer between min and max is equally likely on each draw. When 'no duplicates' is selected, draws are made without replacement — so the count cannot exceed the size of the range.

The generator uses your browser's built-in cryptographic randomness (Web Crypto API), which is considerably stronger than the pseudo-random generators found in simple scripts and is more than sufficient for drawings, games and sampling tasks.

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Worked Example

Rolling a die: min 1, max 5? No — min 1, max 6, count 1 gives a fair six-sided roll. Drawing 5 unique lottery-style numbers from 1–50: set count 5 and check 'no duplicates'.

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Frequently Asked Questions

QAre these numbers truly random?

They come from your browser's cryptographically secure random source, which passes standard statistical randomness tests. For cryptography-grade needs you should still use dedicated tooling, but for picks, draws and games this is ideal.

QCan I generate negative numbers or decimals?

Whole numbers only, but the range can include negatives — e.g. −10 to 10. For decimal values, generate in a larger range and divide by hand.

QCan I guarantee no duplicates?

Yes — enable 'no duplicates' (sampling without replacement). Count must not exceed the size of the range; the tool warns if it does.

How to Use This Calculator

1Set the lowest possible value for the range, defined as the minimum, before generating numbers.

2Set the highest possible value for the range, defined as the maximum, to bound the generation.

3Choose how many numbers to generate and whether repeats are allowed.

4Press Generate — each press produces a fresh set.

Formula Used

uniform integer in [min, max] via the browser's cryptographically secure randomness source

Frequently Asked Questions

QAre these numbers truly random?

QCan I generate negative numbers or decimals?

Whole numbers only, but the range can include negatives — e.g. −10 to 10. For decimal values, generate in a larger range and divide by hand.

QCan I guarantee no duplicates?

Yes — enable 'no duplicates' (sampling without replacement). Count must not exceed the size of the range; the tool warns if it does.