Random Number Generator
Generate secure random integers within a range.
Random
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How it works
How it works
We sample from the browser's cryptographically secure PRNG and use rejection sampling to avoid modulo bias.
- Uniform 32‑bit integers are drawn with
crypto.getRandomValues. - Values above the largest multiple of the range are discarded so each outcome has equal probability.
- This is suitable for tokens and picks, but not a substitute for a full CSPRNG design.
Privacy & Security
All random values stay in your browser.
Accuracy, Limits & Tips
Range limited by 32-bit space; extremely huge spans not supported.
Examples
- Lottery style pick between 1 and 60.
- Random ID between 1000 and 9999.
Looking for broader guides and best practices? Visit the ToolsAreUs Blog for indexes (like the full tool list) and articles (e.g. secure password generation).