Free Tool · No Sign-Up · No Tracking
Generate secure random numbers in any range, with or without repeats. Uses cryptographically secure, unbiased browser randomness — perfect for draws, dice and test data.
Pick a range and press Generate to draw secure random numbers.
Uses the Web Crypto API — cryptographically secure, no bias, no uploads.
Not all random is created equal. Math.random() is a pseudorandom generator seeded from a fixed algorithm — fine for games and animations, but predictable enough that the next value can often be guessed. For draws, giveaways and anything with money on the line, you want cryptographic randomness.
This tool uses the browser's crypto.getRandomValues and applies rejection sampling, which discards out-of-range values instead of nudging them — so every number in your range is exactly as likely as every other. No bias, no shortcuts.
A naive generator computing Math.floor(Math.random() * n) introduces a tiny bias unless n divides evenly into the generator's output space. Rejection sampling fixes this by rerolling whenever the raw value falls outside the largest full multiple of your range — the technique our tool uses.
Negative ranges, like −50 to 50, work the same way: the tool maps the range into a zero-based span, rolls securely, and offsets back. The result is fair at any scale, from a coin flip to a million possible outcomes.
Sometimes repeats are fine (rolling dice), and sometimes they are not (a raffle where each ticket can win once). Our unique mode uses a secure Fisher–Yates shuffle over the whole range and deals out distinct numbers — guaranteeing no duplicates even when you ask for many at once.
The no-repeat mode additionally remembers the last drawn number and skips it, so the same result never appears twice in a row. For pick-the-winner scenarios, our list randomizer is the better fit when candidates have names.
Running a giveaway? Use this tool to draw the number, then the list randomizer to pick winners by name from your entry list.
Frequently Asked
Common questions about generating random numbers, answered by our web experts.
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