Generate one or many random numbers within any range you choose — whole numbers or decimals, with or without repeats. Everything runs in your browser.
Generates whole numbers only, from the minimum up to and including the maximum.
This tool uses your browser's Web Crypto API — specifically crypto.getRandomValues() — which is designed to produce output unpredictable enough for security-sensitive uses, rather than the ordinary Math.random() function most everyday scripts rely on. Computer-generated randomness is still algorithmically produced rather than arising from a physical process, but cryptographically secure random generation is specifically engineered so its output can't be feasibly predicted, which is the standard this tool is built on.
A pseudorandom number comes from a deterministic algorithm: given the same starting point (its "seed"), it will always produce the same sequence, which makes it fast and useful for things like simulations, but unsuitable wherever unpredictability actually matters. A cryptographically secure random number, by contrast, is built specifically so its output can't be predicted or reproduced, even by someone who understands exactly how the generator works. This tool uses the cryptographically secure kind.
Turn off "Allow duplicate numbers" and every value in that batch of results will be unique. Because uniqueness depends on how many distinct values your range actually contains, requesting more unique numbers than the range can supply — for example, 10 unique numbers from a range of only 5 possible integers — isn't possible, and this tool will tell you clearly rather than leaving you waiting.
People use random number generators for all kinds of everyday, low-stakes tasks: picking numbers for a lottery-style draw or office pool, choosing a random number for a game or icebreaker, selecting a random item or index from a list, generating sample or test data for software, or simply settling a decision that doesn't deserve more deliberation than a coin flip.
This tool uses your browser's built-in cryptographically secure random number source (the Web Crypto API's crypto.getRandomValues()) rather than an ordinary pseudorandom function, then maps that randomness onto your chosen range without introducing bias, so every number in the range is equally likely.
Yes. Set "Number of results" to anywhere from 1 to 100 and every result generates together, as a fresh set, each time you click Generate.
Yes. Turn off "Allow duplicate numbers" and every result in that batch will be unique. If you ask for more unique numbers than the range can actually provide, the tool will tell you rather than getting stuck.
Yes. Enter a negative minimum, a negative maximum, or both — for example, a range from -10 to 10, or from -10 to -1.
Yes. Switch to Decimal mode and choose how many decimal places you want (0 to 6). The generated values stay within your chosen range at that precision.
The generation method is cryptographically secure and runs entirely in your browser — nothing you generate is sent to Brekzy. That said, "secure randomness" describes the quality of the number source, not a guarantee about whatever you use the result for.
You can use it to pick numbers, but generating random numbers does not improve your odds of winning a lottery — lottery outcomes are independent of how you chose your numbers, and this tool does not predict or influence draws in any way.
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