Cryptographically Secure Randomness
Most online generators use Math.random(), which is fast but predictable. This tool uses your browser's crypto.getRandomValues — the same secure random source used for encryption keys — with rejection sampling so every number in your range has an exactly equal chance. No bias, no patterns, no server involved.
Popular Uses
- Raffles & giveaways: set the range to your entry count and enable unique numbers to draw several winners fairly.
- Games: dice rolls, coin flips, random turn order.
- Sampling & testing: pick random items, rows or test cases without bias.
- Decisions: can't choose? Assign options to numbers and generate.
Need random passwords instead? Our Password Generator uses the same secure random engine.
Frequently Asked Questions
Are these numbers truly random?
The generator uses crypto.getRandomValues — a cryptographically secure random source with rejection sampling to remove bias. Far stronger than Math.random and suitable for draws, raffles and games.
Can I generate unique numbers with no repeats?
Yes — enable "unique numbers only" and every number is different, like drawing lottery balls without replacement. The range must contain at least as many numbers as you request.
Is a coin flip 50/50 here?
Yes. Each flip uses one cryptographically secure random bit — exactly equal probability of heads and tails.
Can I use this for a raffle or giveaway?
Absolutely. Set the range to your number of entries, enable unique numbers for multiple winners, and generate — results are unbiased and unpredictable.