RNG Generator: Free Random Number Generator Online
Introduction: what is an RNG generator?
An RNG generator, also called a random number generator, produces numbers with no predictable pattern inside a range you choose. This tool creates integers, decimals and digit strings between any two numbers, with or without repeats, using your browser's cryptographic source or an optional seed.
Random numbers are used every day. They decide who wins a giveaway, which student answers next, and which test case a program tries. Doing this by hand is slow and often biased, because people tend to avoid repeats and favour "random-looking" digits like 7.
The RNG Generator solves this in seconds. Set a minimum and a maximum, choose how many numbers you need, and press Generate. It works as a random number generator online, a random number picker, a random integer generator and a random number list generator in one page.
| Quick facts | Detail |
|---|---|
| Cost | Free, no account |
| Range | Any minimum and maximum, including negatives |
| Numbers per run | Up to 1000 |
| Default method | Web Crypto API (crypto.getRandomValues) |
| Seeded method | Mulberry32 pseudo random algorithm |
| Data sent to servers | None |
Features of this random number generator
- Range control. A random number generator between two numbers, with min and max values included.
- No repeats or with repeats. Unique draws use a partial Fisher-Yates shuffle, so each value has an equal chance.
- Multiple numbers. Create a list of up to 1000 values and sort it if needed.
- Seeded mode. Enter a seed to repeat a sequence exactly. Ideal for testing and teaching.
- Secure mode. With no seed, numbers come from the browser's cryptographic generator.
- Decimals and digits. Up to 10 decimal places, or a string of random digits.
- Export. Copy the list or download CSV for Excel and Google Sheets.
- Accessible and private. Dark mode, eight languages, keyboard support, and no tracking of your numbers.
How to use the RNG generator
- Enter a minimum and maximum, or tap a preset such as 1 to 100.
- Choose how many numbers you need, then pick integer, decimal or digits.
- Turn on No repeats if every value must be unique.
- Add a seed only if you need the same results again later.
- Press Generate. Copy the list or download it as CSV.
Presets for the most common ranges
| Range | Typical use |
|---|---|
| 1 to 10 | Quick picks, dice-style choices, classroom turns |
| 1 to 100 | Percentages, giveaways, simple games |
| 1 to 1000 | Raffle tickets, sample IDs, test data |
| 1 to 10000 | Large draws, load testing, statistical samples |
Use it with Excel, Google Sheets and code
For spreadsheets, copy the generated list into a column. Native formulas also exist: =RANDBETWEEN(1,100) in Excel and Google Sheets. Those recalculate on every edit and cannot prevent repeats. In code, Math.floor(Math.random()*100)+1 works in JavaScript and random.randint(1,100) in Python. Neither is secure for passwords or tokens.
Who can use it
| Audience | Example |
|---|---|
| Teachers and students | Fair random picker for questions and group work |
| Game players and hosts | Custom dice, bingo-style numbers, turn order |
| Organizers | Giveaways and draws with a no-repeat winner list |
| Developers and testers | Test data, edge cases, reproducible seeded runs |
| Analysts and researchers | Random samples and simple simulations |
| Spreadsheet users | Random number lists to paste into Excel or Sheets |
How it matters: fairness, testing and trust
Fairness depends on good randomness. A biased generator can tilt a draw, skew a sample or hide a bug. Human choice is the weakest source of all. Research on random number generation shows that people repeat patterns and avoid streaks that true randomness often produces.
It also helps to know which kind of generator you are using. The table below compares the three main types.
| Type | Source | Repeatable | Best for |
|---|---|---|---|
| True RNG (TRNG) | Physical noise such as atmospheric or thermal | No | Certified lotteries, high-stakes draws |
| Pseudo RNG (PRNG) | Formula from a seed | Yes | Simulations, tests, games |
| Cryptographic RNG (CSPRNG) | PRNG seeded by operating system entropy | No | Fair draws, keys, tokens |
This tool's default mode is a CSPRNG. NIST SP 800-90A describes the design of such generators. It is not a certified hardware device, so a regulated lottery should use an audited system.
Conclusion
The RNG Generator gives you fast, fair and private random numbers with clear controls. Choose a range, decide on repeats, and generate. Use secure mode for draws and seeded mode when you need to repeat a result. Bookmark this page for a reliable random number generator whenever you need one.
Frequently asked questions
What is an RNG generator?
An RNG generator, or random number generator, is a tool that produces numbers with no predictable pattern within a range you set. This one runs in your browser and can use cryptographic randomness or a repeatable seed.
Is this random number generator truly random?
By default it uses the Web Crypto API (crypto.getRandomValues), a cryptographically secure source seeded by your operating system. It is not a hardware true random number generator. Seeded mode is pseudo random by design.
How do I generate random numbers without repeats?
Turn on No repeats. The tool uses a partial Fisher-Yates shuffle to return unique values, provided the count does not exceed the size of the range.
How do I get a random number between 1 and 100?
Tap the 1 - 100 preset or enter 1 as the minimum and 100 as the maximum, then press Generate. Both ends are included.
What is a seeded random number generator?
A seeded generator starts from a fixed value, so the same seed and settings always return the same sequence. It is useful for testing and reproducible examples but is not secure.
Can I use it for a lottery or prize draw?
It is suitable for informal draws, classroom picks and giveaways. Regulated lotteries need certified, audited systems and must follow local law.
Does the tool store or send my numbers?
No. Numbers are generated on your device and are not sent to a server. Only your theme and language choice are saved in your browser.