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Random Number Generator
Generate cryptographically strong random integers in any range. Unique values, sorted output, up to 100,000 numbers per click. Free, browser-based.
How to use
Set Range — Enter min and max integers, inclusive on both ends.
Choose Options — Pick the count, whether values must be unique, and whether to sort the output.
Generate — Numbers appear instantly — copy to clipboard or paste into your tool.
The Random Number Generator produces cryptographically strong random integers inside a custom range. Use it for giveaways, lottery picks, sampling, A/B testing, or playful experiments.
Features
Web Crypto (crypto.getRandomValues) — unbiased modulo via rejection sampling.
Custom inclusive range, unlimited integers (up to 100k).
Optional uniqueness and ascending sort.
Pure client-side — no analytics on your numbers.
produces values 1 through 10. Always re-read the docs of any library you use; off-by-one errors in ranges are one of the most common sources of subtle bugs." }} />
Avoiding Modulo Bias
Frequently asked questions
Are these numbers truly random?
When 'secure' is on we use the browser's crypto.getRandomValues — a cryptographically strong pseudo-random source seeded by the OS. For draws and giveaways it is more than enough.
Can I generate lottery picks?
Yes. Turn on 'unique' to ensure no duplicates, set range to e.g. 1–49, and count to 6. Then optionally sort.
What's the max count?
Up to 100,000 numbers per click — plenty for most simulations and sampling.
Does anything leave my browser?
No. All randomness, deduplication, and sorting happens locally with the Web Crypto API.
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