Random Integer Generator
Fast, accurate, and free online Random Integer Generator tool that runs directly in your browser.
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Other tools you may find usefulRandom Integer Generator - Random numbers in the range
Random integers are needed in many contexts: drawing a contest winner, rolling dice, generating test data, card games, algorithms. The generator creates random numbers in the selected range (min-max), optionally without repetitions, with the possibility of generating many at once.
Generator parameters
Range: min and max (inclusive). Quantity: 1-1000 numbers at a time. No repetitions: each number appears max once (requires max-min+1 >= quantity). With repetitions: independent draws. Sorting: result sorted in ascending order or random order. Format: one per line, commas, CSV.
Random algorithm
Math.random(): pseudo-random (PRNG), deterministic with seed. Range: Math.floor(Math.random() * (max - min + 1)) + min. No repetitions: Fisher-Yates shuffle at full range → first N. Alternatively: Set + draw until N unique. Cryptographically secure: crypto.getRandomValues() (for valid draws).
Uses of Random Numbers
Contest/Raffle: Select winner from numbered list. Dice: range 1-6. Card from the deck: 1-52. Card from the group of 4 suits: 1-13 × 4. Lottery Poland: 1-49 (6 unique). Eurojackpot: 1-50 (5) + 1-12 (2). LOTO: 6 of 49. Test PIN: 4 digits (1000-9999). PESEL fragment: random digits.
True random vs pseudo-random
PRNG (Pseudo-Random Number Generator): Math.random(), deterministic, fast. Sufficient for: games, tests, statistics. Cryptographically secure (CSPRNG): crypto.getRandomValues(), unpredictable. Required for: cryptographic keys, security tokens, draws with financial consequences. Random.org: true random from atmospheric noise.
FAQ
How do I randomly select the contest winner?
Number the participants 1-N. Generator: range 1-N, 1 number. Number = winner. Transparency: Record your screen while drawing. Or: Random.org (certified draws). For competitions with prizes: it is worth using CSPRNG or an external website. Document: screenshot of the drawn number + timestamp.
How do lotteries (LOTO 6/49) work?
Physical Ball: N balls in a drum, drawn without repetition. LOTO Polska: 6 out of 49 = 13,983,816 combinations. Chance: 1 in ~14 million. Online algorithm: Fisher-Yates on board [1..49], first 6 results. Important: each combination has equal probability (there are no "hot numbers").
Do certain numbers "fall more often"?
Statistically: no - for a valid PRNG, each number has equal probability. Confirmation bias: we remember confirming cases (17 "came up three times!") and ignore others. Gambler's fallacy: "it didn't last long = it will fall out soon." Statistical test: chi-squared test on distribution = Random.org passes.
How to generate random numbers in Excel?
=RANDOM() or =RAND(): random number 0-1. Range: =INT(RAND()*(max-min+1)+min). No repetition: complicated (use RANK.EQ or VBA). =RANDBETWEEN(1.49): simple limit method. Note: recalculated every time you change the sheet - copy and paste as "Values" to freeze.
How to test a random number generator?
Chi-squared test: check if the distribution is even. Runs test: check for missing patterns. Diehard tests: a set of statistical tests for randomness. TestU01 (L'Ecuyer): PRNG testing library. In practice: Math.random() and crypto.getRandomValues() pass standard tests.
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