Math Tools
Random Number Generator
Generate true random numbers within a range. Perfect for lotteries, contests, raffles, and scientific sampling. Supports unique numbers and sorting.
Use Random Number Generator to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.
Your results will appear here.
About this tool
Whether you are picking a raffle winner, simulating dice rolls, or conducting a randomized trial, you need unbiased random numbers.
This Random Number Generator uses the browser's cryptographically strong random values (where available) to ensure fairness. It is suitable for games, contests, and statistical sampling.
Usage examples
Dice Roll
1 to 6
Range: 1-6, Count: 1 → Result: 4
Lottery
6 numbers, 1-49
Range: 1-49, Count: 6, Unique → 12, 4, 33, 21, 8, 45
How to use
- Set the "Minimum" and "Maximum" values.
- Choose how many numbers to generate.
- Select "Unique" to prevent duplicates.
- Click "Generate" to get your numbers.
Benefits
- Cryptographically strong randomness
- Custom range (negative numbers supported)
- Bulk generation (up to 1000)
- Unique filtering (No repeats)
- Sort option (Low to High)
FAQs
Is this truly random?
Yes, we use the `crypto.getRandomValues()` API which provides better randomness than standard valid math functions. This cryptographically strong random number generator is suitable for applications requiring high-quality randomness like contests, raffles, and simulations.
Can I generate unique numbers only?
Yes, enable the "No Duplicates" option to ensure each number appears only once. The range must be large enough to accommodate the requested quantity. For example, to generate 10 unique numbers, your range must contain at least 10 different values (e.g., 1-10, 5-14, etc.).
What is the maximum quantity I can generate?
You can generate up to 100 random numbers at once. For unique numbers, ensure your range (max - min + 1) is at least equal to the quantity requested. If you need more than 100 numbers, run the tool multiple times or increase your range and filter the results.
Can I use negative numbers?
Yes, you can set both minimum and maximum to any negative or positive values. For example, -100 to 100 will generate numbers in that entire range, including negative values, zero, and positive values. This is useful for scenarios like temperature variations or financial gains/losses.
How is this different from Math.random()?
Math.random() uses a pseudorandom algorithm that's predictable and not suitable for security or high-stakes applications. Our tool uses crypto.getRandomValues() which provides cryptographically secure random numbers from the operating system's entropy source, making it unpredictable and suitable for contests, raffles, and other applications requiring fairness.
Can I use this for lottery or raffle drawings?
Yes! This random number generator is perfect for lottery drawings, raffles, and contests. The cryptographic randomness ensures fairness and unpredictability. For raffles, set your range to match ticket numbers (e.g., 1-500 for 500 tickets), enable "No Duplicates", and generate the number of winners needed. The sorted option helps present results clearly.
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