Units & Numbers Tools
Random Number Generator
Generate random numbers in any range, including unique sets.
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What is Random Numbers?
A random number generator for games, sampling, and giveaways. Choose a range, count, and whether repeats are allowed.
How it works
Numbers come from a seeded, repeatable PRNG (or crypto.getRandomValues when requested) with rejection sampling for the no-duplicates mode.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Draws and test data
Generate 6 unique numbers between 1 and 49 for a draw, or a batch of random values for load-testing data.
Common mistakes
Repeats in unique mode
Drawing without replacement needs a range at least as large as the count — the tool warns when that's impossible.
Frequently asked questions
Is the randomness cryptographically secure?
The generator uses the browser's crypto random source when available, so results are suitable for non-security uses like draws and testing.
Can I allow duplicates?
Yes — toggle between with- and without-replacement modes.