Random Number Generator

What is a Random Number Generator?

A Random Number Generator (RNG) is a tool that produces numbers selected from a specified range without any predictable pattern. Our tool uses the browser's built-in Math.random() combined with crypto.getRandomValues() for cryptographically secure randomness, making it suitable for both casual use and security-sensitive applications.

Common Use Cases

Lotteries & Giveaways

Pick fair, unbiased winners for contests, raffles, or prize draws. Generate unique ticket numbers or select random participants from a list.

Gaming & Simulations

Simulate dice rolls, card draws, or any probabilistic event. Generate random seeds for procedural game content or testing scenarios.

Statistical Sampling

Select random samples from datasets for surveys, A/B testing, or quality control. Ensure unbiased representation in your data analysis.

Password & Token Generation

Create random numeric PINs, OTPs, or numeric portions of secure passwords and authentication tokens.

Education & Mathematics

Demonstrate probability concepts, run Monte Carlo simulations, or generate practice datasets for students.

Key Features

Custom Range Control

Set any minimum and maximum value — from single-digit ranges to billions. Supports both positive and negative numbers for full flexibility.

Integer & Decimal Modes

Generate whole numbers or floating-point decimals with up to 10 decimal places of precision, ideal for scientific and financial calculations.

Unique Number Sets

Enable unique mode to generate lottery-style sets where no number repeats. Perfect for draws, sampling, and non-repeating sequences.

Bulk Generation

Generate up to 1,000 numbers at once. Export results as a comma-separated list or newline-separated for easy use in spreadsheets and code.

Sorted Output

Optionally sort results in ascending or descending order for cleaner presentation and analysis.

Privacy & Security

All random number generation happens entirely in your browser using JavaScript's crypto.getRandomValues() API for cryptographic-quality randomness. No numbers, settings, or results are ever sent to any server — your data stays completely private on your device.

Technical Details

Our generator uses the Web Cryptography API (crypto.getRandomValues()) which provides cryptographically strong random values, unlike Math.random() which is not suitable for security-sensitive applications. For decimal generation, the algorithm generates a random integer and scales it to the desired precision.