Random Number Generator

Generate single values or bulk lists with rules, exclusions, and formatting.

All Tools
Integer mode generates whole numbers. Decimal mode generates floating values with configurable precision.
Up to 10,000 numbers per list.
Digits after decimal point.
Normal-ish clusters near the center.
Works best for integers. For decimals, exclusion is approximate.
Pick how you want to copy/export.
Weighting (optional)
Bias results toward a sub-range
Used only in “Focus around a value”.
Higher means stronger bias.
List
Mini distribution (first 20 bins)

What is a Random Number Generator?

A Random Number Generator (RNG) produces numbers that are unpredictable and evenly distributed within a specified range. This tool allows you to generate random numbers instantly for games, simulations, testing, security-related use cases, and everyday decision making.

Whether you need a single random number or a bulk list, this generator helps you avoid bias and repetition. It runs entirely in your browser and does not store or track any generated values.

Common use cases

  • Generating lottery or raffle numbers
  • Picking winners for contests and giveaways
  • Game development and game logic testing
  • Simulations and statistical sampling
  • Creating test data for software development

How random numbers work

True randomness is difficult to achieve on computers, so most systems use cryptographically secure random number generators to simulate randomness. This tool uses modern browser APIs to produce high-quality random values that are suitable for most practical applications.

Best practices when generating random numbers

  • Define a clear minimum and maximum range
  • Use bulk generation for testing large datasets
  • Avoid reusing random values for security-sensitive tasks
  • Verify range limits to prevent unintended bias
  • Use cryptographic randomness for tokens or secrets

Frequently Asked Questions (FAQ)

1. What is a random number?

A random number is a value selected unpredictably from a defined range, with no pattern or bias influencing the outcome.

2. Are the generated numbers truly random?

The numbers are generated using cryptographically secure browser APIs, which provide high-quality randomness suitable for most use cases.

3. Can I generate multiple random numbers at once?

Yes. Bulk generation allows you to create a list of random numbers within the same range quickly and efficiently.

4. Can I generate decimal or floating-point numbers?

Depending on the selected options, you can generate whole numbers or numbers with decimal precision for simulations and calculations.

5. Is this tool suitable for lotteries or giveaways?

Yes. The generator produces unbiased results, making it suitable for fair selections, raffles, and draws.

6. Can I set a minimum and maximum value?

Yes. You can define a custom range to ensure the generated numbers fall exactly within your required limits.

7. Are repeated numbers possible?

Yes. Random generation can produce duplicates unless a “unique numbers” option is enabled.

8. Does this tool store or track results?

No. All number generation happens locally in your browser. No data is stored or shared.

9. Can I use this for security-sensitive purposes?

For general use, yes. For cryptographic keys or secrets, dedicated security tools are recommended.

10. Is this better than using spreadsheet random functions?

Yes. Spreadsheet functions can be predictable or recalculated unexpectedly, while this tool generates stable results on demand.

Use cases
  • Random selections / lucky draws
  • Test data generation
  • Sampling & simulations
  • Games and dice rolls
Quick presets