Random Number Generator
Pick a min and max, choose how many numbers you want, and instantly generate random integers (or decimals) — with an optional "no repeats" mode for fair draws. Everything runs in your browser; nothing is uploaded.
What is the Random Number Generator?
This random number generator gives you one or many unpredictable numbers inside a range you choose. Set a minimum and a maximum, decide how many numbers you want, and the tool returns whole numbers (or decimals) on the spot. Unlike most generators that only hand you a single value, this one can produce a whole batch at once and, with one toggle, guarantee that every number is different — which is exactly what a fair raffle, a random seating chart, or a sampling task needs.
How to use it
- Type your minimum and maximum values — any whole numbers, including negatives (for example -10 to 10).
- Choose how many numbers you want. Leave it at 1 for a single pick, or raise it to draw a batch.
- (Optional) Turn on No repeats so the results are all unique — perfect for prize draws and assigning numbers.
- (Optional) Switch off integer mode to allow decimals, or set the number of decimal places.
- Press Generate, read your result, and hit Copy to grab it. That's the whole flow — get your numbers and go.
The method behind it
Randomness comes from your browser, not a remote server. Where it is
available, the tool uses the Web Crypto API
(crypto.getRandomValues), which produces cryptographically
strong, unbiased values; on older browsers it falls back to the standard
Math.random. To map raw randomness onto your range, the tool
scales each value across the span from minimum to maximum so that
every value in the range is equally likely — no bias
toward the low or high end.
There are two ways numbers are drawn. In the normal mode each number is independent, so the same value can appear twice in a batch — like rolling a die over and over. When unique mode is on, the tool draws numbers without replacement, removing each drawn value from the pool so it can never come up again. That is the mathematical difference between "with replacement" (repeats allowed) and "without replacement" (all unique), and it is why unique mode requires a range at least as large as the count you ask for.
Examples
- Pick a winner, 1–100: min 1, max 100, count 1 → e.g.
73. - Draw 6 unique raffle tickets, 1–500: min 1, max 500, count 6, No repeats ON → e.g.
412, 38, 207, 9, 311, 156— all different. - Random decimal for a simulation, 0–1: min 0, max 1, integers OFF, 4 decimals → e.g.
0.6172.
Common use cases
- Giveaways and raffles — draw a winning ticket number, or several unique winners at once.
- Classrooms — pick a student at random, split a class into random groups, or randomize question order.
- Sampling and research — select a random subset of rows, participants, or survey IDs without bias.
- Games and tabletop play — generate dice-free rolls, random stats, or starting positions.
- Development and testing — seed test data, pick random ports, or fuzz inputs in a controlled range.
Why use this one
Most online random number tools give you exactly one number and nothing else. This one is built around flexibility on a single screen: any range you like, a single value or a full batch in one click, and a true no-duplicates mode for fair draws. It runs entirely in your browser, so your draws are private and nothing is logged on a server — which matters when a giveaway needs to look (and be) untampered. It is cryptographically strong by default, needs no sign-up or install, and lets you copy results in one tap. Get your numbers and leave.
It is part of a small cluster of randomness tools. For strong, copy-ready passwords try the Password Generator; for tabletop and game rolls the Dice Roller; and for a quick heads-or-tails decision, Coin Flip.
Frequently asked questions
How do I generate random numbers in a specific range like 1 to 100?
Set the minimum to 1 and the maximum to 100, leave the count at 1, and press Generate. You get a single whole number that is at least 1 and at most 100, with both ends of the range included. Change min and max to any whole numbers (including negatives) to draw from a different range.
What does the 'no repeats' (unique) option do?
When unique mode is on, the tool draws numbers without replacement, so every number in your batch is different — like pulling raffle tickets out of a bag instead of putting each one back. This is what you want for prize draws, random seating, or assigning unique IDs. It only works when your range is large enough to hold that many distinct values; if you ask for 50 unique numbers from a range of 10, the tool will tell you it is not possible.
Are these numbers truly random?
They are cryptographically strong pseudo-random numbers. Where your browser supports the Web Crypto API the tool uses crypto.getRandomValues, which is suitable for security-sensitive picks; otherwise it falls back to the standard Math.random. For casual draws, games, and sampling this is more than random enough, and the result is unpredictable and unbiased across your chosen range.
Can it generate decimal numbers, not just whole numbers?
Yes. Turn off integer mode (or set the number of decimal places) to get random decimal values inside your range — useful for simulations, randomized pricing tests, or generating sample data. Integer mode stays on by default because most people want whole numbers.
Are my results sent anywhere or saved?
No. Everything runs locally in your browser. No range, count, or result ever leaves your device or is stored on a server, so your draws stay private — important if you are running a real giveaway or anything that needs to look (and be) fair and untampered.