Random Number Generator_
Generate random numbers in a custom range. Runs entirely in your browser — nothing you paste here is uploaded or logged.
100% client-side — nothing you enter leaves your browser. Free, no signup, no tracking.
How to use
- 01Set the range — presets cover the common asks: a random number generator 1 to 100, 1–10, 1–3, or dice rolls.
- 02Choose how many numbers you need (up to 10,000) and hit Generate — or press Enter in any field.
- 03Switch on “No repeats” to draw unique numbers (a lottery-style draw), and “Sort ascending” for ordered output.
About this random number generator
How does a random number generator work? Most websites use a pseudorandom formula seeded by the clock — deterministic and, for anything sensitive, predictable. This generator instead asks your browser’s cryptographic source (crypto.getRandomValues) for entropy the operating system gathers from hardware events, and maps it onto your range with rejection sampling so every value is exactly equally likely — no modulo bias.
Are random number generators really random? Cryptographically secure ones like this are unpredictable in every practical sense, though physicists would reserve “truly random” for quantum processes. For picking winners, sampling, dice, or test data, this is as fair as it gets — and because it runs entirely in your browser, the numbers are never seen, logged, or influenced by any server.