Free online random number generator: any range from −999,999,999 to 999,999,999, up to 1,000 numbers at once, with or without repeats. No registration required — numbers are produced by the cryptographically strong crypto.getRandomValues algorithm right on your device, with no data sent to a server.
For contests there is a dedicated Giveaway mode: the generator picks winners from a participant list, and built-in screen recording with a watermark proves fairness. For lotteries — 35 presets with real rules (6/45, 5/36, Keno, EuroMillions, Powerball) and exact jackpot odds.
A randomizer is the same thing as a random number generator (RNG): a tool that produces patternless numbers that cannot be predicted in advance. Unlike plain Math.random, a cryptographic generator is unpredictable even for the site's owners.
Why our generator is better
FAQ
How does the random number generator work?
We use crypto.getRandomValues — the standard browser API for cryptographically strong generation. This means numbers can't be predicted, unlike regular Math.random(). Every number is chosen independently, and all values in the chosen range have equal probability.
How do I get a random number between 1 and 100?
Press the "1–100" button below "Generate" — the range is set automatically and the number appears right away. The "1–10" and "1–1000" buttons work the same, and any other range can be set in the "From" and "To" fields.
Can I use the generator for a giveaway on social media?
Yes. Switch to "Giveaway" mode, paste the participant list (one per line or comma-separated), set the number of winners — the generator picks them with the same cryptographically strong algorithm. For transparency, record your screen: the video is saved with the site watermark, and the result can be exported as a PNG image.
Is a randomizer the same as a random number generator?
Yes. Randomizer is the informal name for a random number generator (RNG). Both words mean a tool that produces numbers with no pattern. This page runs a cryptographically strong version of such a generator: the result is unpredictable even for the site's developers.
What is the maximum range?
From −999,999,999 to 999,999,999. You can get up to 1,000 numbers per generation.
Are the numbers truly random or can they be predicted?
Numbers are truly random — generation uses the browser's cryptographically strong API (crypto.getRandomValues). Neither we nor our server know the result in advance. You can verify by pressing the button multiple times — each press gives different numbers.
How do I improve my odds of winning a lottery?
Winning probability is fixed by the lottery rules and doesn't depend on how you pick numbers. However, you can check real draw statistics on each lottery page — we show how often each ball appeared in hundreds of recent draws. It won't guarantee a win, but it helps make an informed choice.
Which sum of numbers comes up most often?
The sum of a random combination gravitates toward the expected value — the midpoint between the minimum and maximum possible sums. For example, in a 6-of-45 format sums range from 21 to 255, and values around 138 come up most often. In lottery mode the generator shows the sum and expected value under the combination, and real draw sum frequencies are available on any lottery's Draw Sums page.
Can I exclude specific numbers?
Yes, in "Universal" mode open the "Advanced" block and list numbers separated by commas or spaces. They won't appear in the result.
Are results saved?
The generation history (up to 1,000 entries) stays on the page while the tab is open; any entry can be copied or saved as a PNG image. Permanent links to giveaway results are coming later.
What is a random number generator for
A random number generator (RNG, randomizer) is an online tool that produces a sequence of numbers with no underlying pattern. It's used for running lotteries and social media giveaways (VK, Telegram, Classmates), picking contest winners, drawing lots, simulating dice or coin tosses, scientific experiments and algorithm testing.
Unlike competitors, our randomizer uses a cryptographically strong algorithm — crypto.getRandomValues, built into your browser. This means no party (not us, not our server, not even you) can predict or tamper with the result in advance. Generation happens entirely on your device, without sending data to a server.
What makes this generator different
Most sites simply spit out numbers in a vacuum. We're a lottery service with draw archives for 190+ lotteries from 28 countries (Gosloto, Sportloto, EuroMillions, Powerball, Mega Millions, EuroJackpot and many more), and we link generated numbers to real games: we show exact jackpot odds (via combinatorics on BigInt), link to the draw archive, and show frequency statistics for each number.
If you need a simple online randomizer — use the universal mode and get numbers in any range. If you're about to play a lottery — switch to "For Lottery" mode, pick a preset, and see not just the drawn balls but mathematically precise winning odds and a link to the lottery page with a full archive.