Random Number Generator
Free online Random Number Generator using browser-native Web Crypto API (`crypto.getRandomValues`). Pick custom minimum and maximum bounds, generate multiple numbers, toggle unique results, or create random decimal numbers. 100% private, fast, and runs locally in your browser.
Your files never leave your device. All processing happens on your device. No uploads, ever.
How to use Random Number Generator
- 1
Set Min & Max
Enter lower and upper numerical bounds.
- 2
Select Quantity & Mode
Choose integer vs decimal mode and number of results.
- 3
Generate & Copy
Click Generate to get instant cryptographically random results and copy to clipboard.
Cryptographically Secure Web Crypto Randomness
Unlike basic tools using Math.random(), our generator relies on `window.crypto.getRandomValues()` to ensure cryptographically unbiased random integer and decimal sampling.
Unique List Sampling & Boundary Validation
Need non-repeating numbers for a raffle or lottery draw? Enable the 'Unique Numbers' toggle to guarantee zero duplicates within your specified range.
Frequently asked questions
How does Web Crypto API ensure unbiased random numbers?
The browser's Web Crypto API draws entropy directly from OS-level hardware state, eliminating algorithmic pseudo-random bias present in standard PRNGs.
What happens if unique mode is requested for more numbers than exist in range?
The engine automatically validates your request and alerts you if the requested count exceeds the available range size.
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Last updated 10 August 2026