Free Random Number Generator
Generate random numbers instantly. Choose from integers, decimals, primes, or percentages. Set custom ranges, control quantity, unique values, and sorting. CSPRNG secure — no signup, no watermarks.
All random numbers are generated locally in your browser using CSPRNG. Your data never leaves your device. No signup, no tracking, no watermarks.
Free Random Number Generator – Cryptographically Secure & Customizable
Our free random number generator helps you create truly unpredictable numbers for any application. Use it for lottery drawings, gaming mechanics, statistical sampling, software testing, scientific simulations, or educational purposes. Choose from integers, decimals, prime numbers, or percentages — all with cryptographically secure randomness. Generate up to 1,000 numbers at once, enable unique values, sort results, and export in multiple formats. No signup required, no watermarks, and everything runs locally in your browser.
Set any min/max from -1M to 1M. Quick presets for common ranges like 1-10, 1-100, 1-1000, lottery picks, and 4-digit codes.
Integers, decimals (1-10 decimal places), prime numbers (Sieve of Eratosthenes), and percentages (0-100%).
Generate up to 1,000 numbers in a single click. Perfect for Monte Carlo simulations and statistical sampling.
Ensure no duplicates with sampling without replacement. Sort results ascending or descending.
View count, min, max, and average of generated numbers instantly.
Copy to clipboard or export as TXT, CSV, JSON, or download all formats in a ZIP file.
How to Generate Random Numbers Online for Free
1. Set your desired range (min and max). Use quick presets or adjust with +/- buttons.
2. Choose number type: integer, decimal (set decimal places), prime, or percentage.
3. Specify how many numbers to generate (1–1000).
4. Optional: enable unique values to prevent duplicates, and choose sort order.
5. Click "Generate Random Numbers" to see results instantly.
6. Review statistics, copy to clipboard, or export in your preferred format.
Why Use This Random Number Generator?
- Completely free and unlimited — no watermarks, no signup, no premium tiers.
- Cryptographically secure (CSPRNG) — uses Crypto.getRandomValues(), NIST SP 800-90A compliant.
- True uniform distribution — every number within your range has equal probability.
- Privacy-focused — all generation happens locally in your browser. No server uploads, no data collection.
- Works offline — once the page is loaded, you can use it without an internet connection.
- Perfect for developers, educators, and content creators — lottery numbers, game mechanics, test data, and more.
Common Use Cases for Random Numbers
Our random number generator is ideal for lottery number generation (Powerball 1-69, Mega Millions 1-70), dice simulation (1-6), statistical sampling and Monte Carlo simulations, random assignment in A/B testing, generating test data for QA, cryptographic nonce values, random selection for giveaways and raffles, and educational probability demonstrations.
Frequently Asked Questions
Learn how to use this tool correctly by reading our step-by-step tutorial.
