Random Number Generator Online — Fast and Free
Generate random numbers in any range instantly. Perfect for raffles, games, statistics and any decision that needs real randomness. No sign-up, 100% free, and generated locally in your browser — nothing is sent to any server.
✦ Local AI · No storage · No sign-up · Free
Last updated: September 22, 2026
✦ Resultado generado con IA
How it works
Most "random" number generators on the web use JavaScript's Math.random(), which is actually a pseudo-random number generator (PRNG): it produces a deterministic sequence from an internal seed, predictable if someone knows the algorithm and the engine's state. For raffles, games, or any case where fairness matters, that's a real weakness, not a technical curiosity.
This generator uses crypto.getRandomValues(), the browser's native cryptography API — the same one used by password managers and web encryption systems. It draws entropy from the operating system (hardware noise, event timing, unpredictable physical sources) instead of a mathematical formula with internal state. The result cannot be reproduced or predicted even if the full source code is known.
All computation happens on your device. The range you configure (minimum and maximum) is processed locally and the number never travels to any server — you can confirm this by opening your browser's developer tools "Network" tab while generating: you won't see any outgoing request.
Entropy by range size
| Range 1-6 | 2.58 bits |
| Range 1-10 | 3.32 bits |
| Range 1-100 | 6.64 bits |
| Range 1-1,000,000 | 19.93 bits |
What is it for?
- ✓Fair raffles and drawings among participants
- ✓Board games that need custom dice
- ✓Statistical sampling and scientific experiments
- ✓Selecting a winner from a group of people
- ✓Generating one-time PINs or temporary codes
- ✓Randomly picking an item from a long list
- ✓Simulations and algorithm testing that require random inputs
- ✓Classroom probability activities
Frequently asked questions
- How do I generate a random number online?
- Use our generator, set the minimum and maximum range, and click Generate. The result is instant and generated locally in your browser.
- Is the number generator truly random?
- Yes. We use the browser's crypto.getRandomValues() API, which generates cryptographically secure numbers with no predictable patterns — unlike Math.random(), which is pseudo-random and reproducible.
- Can I generate numbers without repeats?
- Yes. Click Generate multiple times and the history keeps your last 20 results so you can verify there are no repeats.
- Are my numbers stored on any server?
- No. Everything happens in your browser. We don't send any data to external servers.
- What's the difference with Math.random()?
- Math.random() uses a pseudo-random algorithm with an internal seed: fast, but theoretically predictable. crypto.getRandomValues() uses real entropy from the operating system, making it cryptographically secure and suitable for raffles and any use case where fairness matters.
- Can I use this generator for an official or legal raffle?
- Technically the generation method is fair and verifiable, but for raffles with legal implications (prizes of value, regulatory requirements) check your country's regulations on certified drawing mechanisms.