Random Number Generator

What is a Random Number Generator?

Our random number generator (RNG) creates unpredictable numbers within a specified range. You can produce integers or decimal numbers, and optionally avoid duplicates. It’s an essential tool for simulations, sampling, data testing, and everyday decisions, and it requires no software installation.

How to Generate Random Numbers

1. Set the range: Enter the minimum and maximum values. The generator will stay within these boundaries.
2. Choose decimal precision: Set the number of decimal places (0 for integers, up to 10 for fine‑grained decimals).
3. Specify the count: Enter how many random numbers you want (1 to 1000).
4. Enable or disable duplicates: Check the box if you want repeated numbers; otherwise each number will be unique (if the range allows).
5. Click "Generate": The tool will instantly display a list of random numbers. Use the Copy button to export them.

When to Use a Random Number Generator

• Statistical sampling: Pick random samples from a population for surveys or testing.
• Lotteries and contests: Draw winners from a pool of entries.
• Game development: Simulate dice rolls, random events, or procedural generation.
• Educational exercises: Create random arithmetic problems or data sets for math practice.
• Data verification: Insert random test data into a database or spreadsheet.

Frequently Asked Questions

Is the generator truly random?

For most practical purposes, yes. It uses the browser’s cryptographic‑quality random number generator (Crypto.getRandomValues), which is suitable for non‑gambling applications.

Can I generate very large numbers?

JavaScript numbers have a safe integer range of about ±9 quadrillion. You can enter values up to these limits, but be mindful that very large ranges with many decimal places may reduce performance.

Is my data secure?

All calculations happen client‑side. Your settings and generated numbers stay on your device and are never transmitted.