Are the generated numbers truly random?

The numbers are pseudo-random—generated using algorithms, not truly random. For most purposes (games, testing, simulations), pseudo-random numbers are sufficient. For cryptographically secure random numbers, use specialized security tools. The tool uses JavaScript's Math.random() which provides good pseudo-randomness for general use.

Can I generate negative numbers?

Yes! Set minimum to a negative value (e.g., -100) and maximum to a positive value (e.g., 100). The tool supports any range, including negative numbers, zero, or positive numbers. Just ensure minimum < maximum.

What's the difference between integer and decimal?

Integer numbers are whole numbers (e.g., 1, 5, 100). Decimal numbers include decimal places (e.g., 1.23, 5.67, 100.45). Choose integer for whole numbers, decimal for numbers with fractional parts. Decimal numbers are rounded to 2 decimal places.

Can I generate the same random numbers again?

No, random number generators produce different numbers each time. If you need reproducible sequences, use programming libraries with seed values. This tool generates new random numbers each time you click 'Generate'.

Are the numbers uniformly distributed?

Yes, the tool generates numbers with uniform distribution—each number in the range has equal probability of being generated. This means all numbers are equally likely, which is suitable for most random selection purposes.

Random Number Generator - Generate Numbers Free

When to Use This Tool

Use this when:

You need random numbers for games, lotteries, or random selection
You're testing applications and need random test data
You're running simulations and need random input values
You want to generate random samples for statistical analysis
You need random numbers for educational purposes or demonstrations
You're creating random sequences for algorithms or data structures
You want to pick random winners or make random decisions

Don't use this if:

You need cryptographically secure random numbers for security purposes (use specialized security tools)
You require random numbers with specific statistical distributions (use statistical software)
You need reproducible random sequences with seeds (use programming libraries)
You want to generate random numbers offline without browser access (use command-line tools)
You require very large quantities of random numbers (over 1000 at once)

What is a Random Number Generator?

A random number generator produces random integers or decimal numbers within a specified range using cryptographic randomness. Our generator runs entirely in your browser using the Web Crypto API — no server interaction, no tracking.

Random number generation is used across many fields: gaming and lottery simulations, statistical sampling, random assignment in research experiments, generating test data, making fair random decisions, and educational probability demonstrations.

This tool is useful for researchers performing random sampling and group assignments, teachers creating random problem sets and student groupings, game masters generating random dice rolls and outcomes, developers creating test data with random values, and statisticians running probability simulations.

Compared to basic random functions in programming languages (Math.random() in JavaScript provides only pseudo-random numbers), hardware random number generators (expensive and specialized), or online generators that may not be truly random, PureXio uses the browser's Web Crypto API (crypto.getRandomValues) for cryptographic-quality randomness.

The tool supports integer and decimal ranges (e.g., 1–100, 0.0–1.0), bulk generation of multiple random numbers at once, configurable decimal precision, no-repeat mode (unique random numbers within a range), and sorting options for generated sets. Results can be copied individually, as a comma-separated list, or downloaded for further use.

Best for: generating cryptographically random numbers in any range. Integer and decimal support, bulk generation, no-repeat mode. Uses Web Crypto API.

How to Generate Random Numbers

Set minimum and maximum values for the range. Enter the count of numbers to generate (1-1000). Choose number type: Integer (whole numbers) or Decimal (with decimal places)

Click 'Generate Numbers' to create random numbers. Numbers appear instantly in the results area

Review generated numbers. Copy individual numbers or copy all numbers at once. Regenerate to create new random numbers with same settings

Common Use Cases

Generate random numbers for games: Roll dice (1-6), pick lottery numbers (1-49), or random selection

Create test data: Generate random values for application testing or debugging

Run simulations: Generate random input values for Monte Carlo simulations or modeling

Random sampling: Generate random samples from a range for statistical analysis

Educational purposes: Demonstrate randomness, probability, or random number generation

Random selection: Pick random winners, assign random tasks, or make random decisions

Algorithm testing: Generate random sequences for testing sorting, searching, or other algorithms

Features

Generate random numbers in any custom range (minimum to maximum)

Support for integer numbers (whole numbers) or decimal numbers

Generate multiple random numbers at once (up to 1000 numbers)

Uniform distribution—each number in range has equal probability

Real-time generation—numbers appear instantly

One-click copy for individual numbers or all numbers

100% private—all generation happens locally in your browser

Limitations & Constraints

Maximum 1000 numbers can be generated at once—for more, generate in multiple batches

Uses browser's Math.random()—not cryptographically secure (suitable for games/testing, not security)

Random numbers are pseudo-random—generated algorithmically, not truly random

Decimal precision is limited to 2 decimal places for readability

Very large ranges or very small ranges may have precision limitations

Troubleshooting

Number generation fails or shows error

Solution: Check that minimum and maximum values are valid numbers. Minimum must be less than maximum. Count must be between 1 and 1000. Ensure all fields contain valid numbers. Prevention: Enter valid numbers and ensure minimum < maximum.

Generated numbers seem to repeat or not random

Solution: Random number generators use algorithms that may produce patterns over time. For truly random numbers, use cryptographically secure generators. For most purposes (games, testing), pseudo-random numbers are sufficient. If you see obvious patterns, try generating more numbers or using a different range. Prevention: Understand that pseudo-random numbers may show patterns.

Need more than 1000 numbers

Solution: Generate numbers in batches—generate 1000, copy them, then generate another batch. The limit of 1000 is to prevent browser performance issues. For very large quantities, generate multiple batches or use command-line tools. Prevention: Generate numbers in batches if you need many at once.

Decimal numbers have too many or too few decimal places

Solution: Decimal numbers are rounded to 2 decimal places for readability. If you need more precision, the tool may not support it. For high-precision random decimals, use programming libraries or specialized tools. Prevention: Understand that decimal precision is limited to 2 places.

Need cryptographically secure random numbers

Solution: This tool uses Math.random() which is not cryptographically secure. For security purposes (passwords, encryption keys), use specialized cryptographic random number generators or the Web Crypto API. This tool is suitable for games, testing, and general randomness, not security. Prevention: Use cryptographic tools for security-critical random numbers.