Click "Generate" to create random numbers.
About Random Number Generator
True randomness is surprisingly difficult to achieve. Standard programming functions like Math.random() use pseudo-random algorithms that are predictable if the seed is known. For applications requiring fairness and unpredictability — raffles, gaming, sampling, and security — cryptographic randomness is essential. This tool leverages the Web Crypto API, which sources entropy from the operating system's hardware random number generator, to produce integers that are uniformly distributed across your specified range. The results are suitable for fair draws, statistical experiments, and test data generation.
How to Use Random Number Generator
- Enter the Min (minimum) and Max (maximum) values to define the range.
- Set the Quantity — how many random numbers you want.
- Click generate. The random numbers appear in the output area.
- Click Copy all to place the entire list on your clipboard.
Key Features
- Cryptographically secure randomness via the Web Crypto API
- Customizable range — any integer minimum and maximum
- Generate multiple numbers at once with adjustable quantity
- One-click Copy all for easy pasting into spreadsheets or code
- Entirely browser-based — no server interaction, no data stored
When to Use This Tool
- Running fair raffles, draws, or lottery-style selections
- Generating random sample indices for statistical research
- Creating test data for software development and QA
- Picking random numbers for games, dice rolls, or classroom activities
- Seeding experiments or simulations with random inputs
Technical Details
The tool calls crypto.getRandomValues() to obtain cryptographic-quality random bytes, then maps them uniformly to the requested integer range using rejection sampling to avoid modulo bias. Each number in the output is independently generated. By default, duplicates are possible; for unique numbers, use a range at least as large as the requested quantity. For random text generation, see the Random String Generator or Random Name Generator.
Conclusion
When you need genuinely random integers — for draws, testing, or research — this free Random Number Generator delivers cryptographically secure results directly in your browser. No installation, no sign-up, and no data ever leaves your device.