Random Number Generator
Pick random numbers between any range, with or without duplicates. Free, instant, and private.
Use the Random Number Generator →Need a quick random number? Set your minimum and maximum values, choose how many numbers you need, and generate instantly. It’s perfect for lottery picks, contest winners, classroom activities, dice rolls, or statistical sampling.
It’s completely free — no signup, no credit card, no hidden limits. All processing runs locally in your browser using cryptographically secure randomness. Your data never leaves your device.
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Try TinyToolbox Premium for sorted output, CSV export, and unique-pick guarantee on large ranges.
Use the Free ToolHow to Use a Random Number Generator
A random number generator (RNG) is a tool that produces sequences of numbers that lack any predictable pattern. Our version uses crypto.getRandomValues() — the gold standard for browser-based cryptographic randomness.
Whether you need a single random pick or a batch of numbers, the process is simple: define your range (minimum and maximum), choose how many numbers to generate, decide whether duplicates are allowed, and click generate. Results appear instantly with visual styling that distinguishes even, odd, and prime numbers.
Common use cases include picking lottery numbers (e.g., 6 numbers from 1–49), simulating dice rolls (1–6), selecting random survey participants, assigning random IDs, or settling friendly debates when no one can agree on a choice.
Why Use a Browser-Based RNG?
Server-based random number generators send your data over the internet, which adds latency and privacy concerns. Browser-based RNGs like this one generate numbers locally on your device — the results appear instantly and nothing is transmitted. This makes it ideal for sensitive applications like contest drawings or statistical sampling where trust is important.
The cryptographic randomness provided by window.crypto.getRandomValues() is the same technology used for encryption keys and secure tokens. It is certified for most non-regulatory random selection needs and provides uniform distribution across your chosen range.
Tips for Fair Random Selection
- Always pre-define your range and criteria before generating — avoid "re-rolling" until you get a result you like.
- For contest winners, uncheck "Allow duplicates" to ensure each entry is only picked once.
- For lottery-style draws, generate all numbers at once rather than one at a time.
- Use the sum and average displayed after generation to spot-check for obvious bias (though with cryptographic randomness, bias is extremely unlikely).
More Questions About Random Number Generators
How is this different from Math.random()?
This tool uses crypto.getRandomValues() instead of Math.random(). While Math.random() is pseudorandom and suitable for basic uses, crypto.getRandomValues() provides cryptographically secure randomness drawn from the operating system's entropy sources. It is more suitable for contests, security-related picks, and any situation where unpredictability matters.
Can I generate negative numbers?
Yes. Set your minimum to a negative value (like -100) and maximum to a positive value (like 100). The tool handles the full range from -999,999 to 999,999.
What happens if I need more than 100 numbers?
Generate multiple batches of up to 100 numbers each. Each generation is independent, so running it 10 times gives you 1,000 total random numbers across the same range.