Random Number Generator.
Generate truly random integers or decimals in any range — one at a time or in bulk, up to 999 digits of precision. Runs entirely in your browser, nothing ever leaves your device.
Click Generate to produce numbers.
Why Use This Random Number Generator?
Our generator uses the browser's built-in crypto.getRandomValues() API — a cryptographically secure source of randomness, not the weak Math.random() — so every result is genuinely unpredictable.
Cryptographically Secure: Uses crypto.getRandomValues() for true unpredictability — the same API used to generate encryption keys, far safer than Math.random().
Huge Number Support: The Comprehensive tab handles integers and decimals with up to 999 digits of precision using BigInt arithmetic, far beyond JavaScript's native number limits.
Bulk & Flexible: Generate up to 1000 numbers at once with optional duplicate prevention, ascending or descending sort, and one-click copy or .txt download.
How to Use the Random Number Generator
Choose a tab: use Basic for everyday ranges (up to ±1,000,000) or Comprehensive for giant integers or high-precision decimals.
Set your range: enter Min and Max values, then pick Single for one result or List and set your desired count (up to 1000).
Configure options: toggle duplicate prevention and choose a sort order. In Comprehensive mode, also pick Integer or Decimal and set the number of decimal places.
Copy or download: click Copy to grab a single result, Copy All for the full list, or Download .txt to save as a file.
Frequently Asked Questions
Is this random number generator truly random?
Yes. It uses crypto.getRandomValues(), a cryptographically secure pseudorandom number generator built into every modern browser. It draws from the OS entropy pool and is far more unpredictable than Math.random().
What is the maximum number size I can generate?
In Basic mode, Min and Max are limited to ±1,000,000. In Comprehensive mode, you can enter integers with up to 999 digits — far beyond JavaScript's safe integer limit — because the tool uses BigInt arithmetic internally.
Can I generate decimal numbers?
Yes, in the Comprehensive tab. Switch the type to Decimal and set the number of decimal places (1–999). The tool scales the range to integer arithmetic using BigInt, then formats the result with the correct decimal point.
Can I generate numbers without repeats?
Yes. In List mode, enable No Duplicates. The generator will produce a unique set of numbers as long as the range (Max − Min + 1) is at least as large as the requested count.
Can I use this for a lottery or raffle?
Absolutely. Enable No Duplicates and set your range to match the lottery pool. Each draw is statistically independent and uses a secure random source, making it suitable for fair selection.
Does the tool store or send my numbers anywhere?
No. All generation happens inside your browser. No data is ever sent to a server, logged, or stored anywhere. Refreshing the page clears all results.
What is the difference between crypto.getRandomValues() and Math.random()?
Math.random() uses a deterministic algorithm seeded by the system clock — it can be predicted under some conditions. crypto.getRandomValues() draws from the OS entropy pool and is designed for cryptographic use, making it the gold standard for unpredictability.