Random Number Generator
Generate truly random numbers using your browser's cryptographic random source. Quick presets for dice, lottery, and common ranges; supports integers, decimals, unique-only mode, and bulk generation. 100% browser-based.
Quick Reference
- Both min and max are inclusive — Min 1, Max 6 can produce 1, 2, 3, 4, 5, or 6.
- Unique only requires the range size to be at least the quantity.
- Crypto-secure — uses
crypto.getRandomValues()for true randomness. - Max quantity per generation: 100 numbers.
How to Use the Random Number Generator
- Pick a preset (Coin Flip, Dice, D20, Lottery, etc.) or set your own Min, Max, and Quantity.
- Choose Integer for whole numbers or Decimal with a precision (1–10 decimal places).
- Tick Unique only if you don't want duplicates (e.g. for lottery numbers).
- Optionally sort the output ascending or descending.
- Click Generate — numbers appear with a satisfying roll animation. Click Copy All to grab them.
How Does Random Number Generation Work?
Computers are deterministic, so "true" randomness has to come from somewhere external. This tool uses the browser's crypto.getRandomValues() API, which draws entropy from hardware sources — mouse movements, keyboard timings, system events — to produce cryptographically secure pseudo-random values. We also use rejection sampling to eliminate modulo bias, so every value in your chosen range has exactly equal probability.
Common Uses for a Random Number Generator
- Tabletop games — simulate dice rolls (D4, D6, D20, D100) when you don't have physical dice.
- Lottery & raffles — pick winning numbers or draw raffle entries.
- Decision making — break a tie or pick from a list of options.
- Sample data — generate test data for spreadsheets, code, or QA scenarios.
- Education — demonstrate probability, statistics, and distributions in classrooms.
- Games of chance — coin flips, color picks, "pick a card" style games.
- Research — randomly select participants, samples, or experimental conditions.
Why Choose Our Random Number Generator
- Privacy-first — 100% browser-based. No data sent to any server.
- Cryptographically secure — uses the same source as web security APIs.
- Bias-free — rejection sampling ensures uniform distribution.
- Six quick presets — common scenarios one click away.
- Bulk generation — up to 100 numbers per click, with unique-only, sorting, and stats.
- Decimal support — generate floating-point values with custom precision.
- No signup, no tracking, no ads in your data.
Frequently Asked Questions
Are these numbers truly random?
They're cryptographically secure pseudo-random — the highest quality randomness available in a browser, drawn from system entropy sources. For all practical purposes including games, raffles, and statistical sampling, they're as random as you need.
Can I trust this for serious lottery picks?
Yes — the distribution is mathematically uniform across your chosen range. That said, lottery outcomes are independent random events regardless of how you pick, so any method works equally well in the long run.
How is "unique only" different from regular generation?
Regular generation can repeat the same number multiple times (each pick is independent). Unique only generates without replacement — like drawing balls from a bag and not putting them back. Useful for lottery numbers, raffle picks, or any "no duplicates" scenario. The range size must be at least the quantity.
What's the maximum range?
Min and Max can each go up to ±2,147,483,647 (32-bit integer range). Quantity is capped at 100 per generation to keep the UI fast and readable.
Does the random generator work offline?
Yes. Once the page is loaded, all randomness is generated locally by your browser — no internet needed.