Free, browser-based random number generator. Lottery picks, dice rolls, coin flips and more.

TheRandomNumber.com is a free random number generator that runs entirely in your browser — no sign-up, no tracking and nothing sent to any server. It uses window.crypto.getRandomValues, the same cryptographic API used in browser security software, to ensure every result is statistically unpredictable and unbiased.

The tool covers six use cases: generating a single random number in any range, picking lottery numbers for major draws worldwide, rolling polyhedral dice for tabletop games, flipping a fair virtual coin, selecting a random name from a list and generating batches of unique random numbers.

Random Number Generator

Enter any minimum and maximum value to generate a cryptographically random number in that range instantly. Works for 1 to 10, 1 to 100, 1 to a million or any range you choose.

Your number will appear here

Lottery Number Generator

Generate random lottery numbers for Powerball, Mega Millions, EuroMillions, UK Lotto or Lotto NZ — or set a custom range. Numbers are drawn without replacement, exactly as in a real lottery draw.

Your lucky numbers will appear here

Dice Roller

Roll any standard polyhedral dice — D4, D6, D8, D10, D12, D20 or D100. Roll up to 20 dice at once and get individual results plus a combined total. Useful for Dungeons and Dragons, Pathfinder and other tabletop RPGs.

Roll the dice to see results

Coin Flip

Flip a fair virtual coin for an instant heads or tails result. Each flip gives both outcomes an exact 50% probability using cryptographic randomness. Flip history is tracked for the session.

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Random Name Picker

Paste a list of names — one per line — and click Pick a Name to randomly select one. Every name has an equal probability of being chosen. Ideal for classroom draws, competition winners, team selections and workplace raffles.

The chosen name will appear here

Multiple Random Numbers

Generate a list of random numbers between any minimum and maximum. Enable No Duplicates to ensure every number in the list is unique — drawn without replacement. Useful for random sampling, test data and lottery entries.

Your numbers will appear here

About TheRandomNumber.com

TheRandomNumber.com is a free, browser-based random number generator built for fast, unbiased results. It requires no account, uses no tracking cookies and processes everything locally using JavaScript — no data leaves your device.

How the randomness works

All results are generated using window.crypto.getRandomValues(), the Web Cryptography API built into every modern browser. This API draws from the operating system's entropy pool — hardware events including CPU timing, keyboard input and system state — to produce numbers that are cryptographically unpredictable. This is materially stronger than Math.random(), which uses a seeded pseudo-random algorithm that can theoretically be reproduced. For lottery picks, games, giveaways and classroom use, the results are effectively indistinguishable from true randomness.

Who this tool is for

TheRandomNumber.com is designed for everyday use: picking lottery numbers, making fair decisions in games, running classroom draws, playing tabletop RPGs, selecting giveaway winners or generating test data. The tool is not intended as a substitute for dedicated cryptographic key generation in security-sensitive applications.

Privacy

No personal data is collected. All generation happens client-side. There is no server, no database and no record of the numbers generated. The names you enter in the Name Picker stay on your device and are not transmitted anywhere.

Frequently Asked Questions

What is a random number generator?
A random number generator (RNG) is a tool or algorithm that produces numbers with no predictable pattern, where each number in a given range has an equal probability of being selected. Online RNGs use software to simulate this process, drawing from sources of entropy to produce statistically unpredictable results. TheRandomNumber.com uses window.crypto.getRandomValues, the Web Cryptography API built into every modern browser, for cryptographically strong randomness.
How do I generate a random number between 1 and 10?
Open the Random Number tab, set the minimum to 1 and the maximum to 10, then click Generate. A random number in that range appears instantly. You can set the range to any values — there is no limit on range size.
Can I use this to pick lottery numbers?
Yes. The Lottery tab generates numbers for Powerball (5 from 1–69 + Powerball 1–26), Mega Millions (5 from 1–70 + Mega Ball 1–25), EuroMillions (5 from 1–50 + 2 Lucky Stars 1–12), UK Lotto (6 from 1–59) and Lotto NZ (6 from 1–40). Numbers are drawn without replacement, matching the rules of the real draws. A custom option lets you set any range and pick count.
Is this random number generator truly random?
This tool uses window.crypto.getRandomValues, the browser's built-in cryptographic API, which draws from the operating system's entropy pool. Results are cryptographically unpredictable and cannot be reproduced — materially stronger than Math.random(), which uses a seeded pseudo-random algorithm. For lottery picks, games, giveaways and everyday use, results are effectively indistinguishable from true randomness.
What is the difference between a pseudo-random and a truly random number generator?
A pseudo-random number generator (PRNG) uses a deterministic algorithm seeded with an initial value to produce sequences that appear random but can be reproduced. A cryptographically secure random number generator (CSPRNG) draws from hardware entropy, making results genuinely unpredictable. JavaScript's Math.random() is a PRNG. This tool uses window.crypto.getRandomValues, a CSPRNG, for all results.
How do I roll a D20 online?
Go to the Dice Roller tab and click D20. Click Roll and you get an instant result between 1 and 20. You can roll multiple D20s at once and get a combined total. The dice roller supports D4, D6, D8, D10, D12, D20 and D100 — suitable for Dungeons and Dragons, Pathfinder and other tabletop RPGs.
What is dice notation (NdX)?
Dice notation uses the format NdX, where N is the number of dice and X is the number of sides per die. For example, 2d6 means rolling two six-sided dice (total range: 2–12), and 1d20 means rolling one twenty-sided die (range: 1–20). This notation is standard in tabletop RPGs including Dungeons and Dragons and Pathfinder.
What is the probability of rolling a 20 on a D20?
The probability of rolling a natural 20 on a fair D20 is exactly 1 in 20, or 5%. Each face has an equal 5% probability on any given roll. Because this tool uses cryptographic randomness, each roll is statistically independent — previous results have no effect on future ones.
How do I pick a random name from a list?
Open the Name Picker tab and paste your list of names into the text box — one per line. Click Pick a Name and the tool randomly selects one, giving every name an equal probability of being chosen. This works for classroom draws, competition winners, team selections and workplace raffles. There is no limit on the number of names.
How do I pick a random winner for a competition or giveaway?
Open the Name Picker tab, paste all entrant names — one per line — and click Pick a Name. Each name has an equal chance of being selected. For transparency, screen-recording the process gives participants verifiable proof that the selection was fair.
Is a virtual coin flip fair?
Yes. Each flip generates a cryptographically random integer of either 0 or 1, giving heads and tails an exact 50% probability. Unlike a physical coin, there is no bias from coin weight, flip technique or landing surface.
Can I generate multiple random numbers at once?
Yes. The Multiple Numbers tab generates as many random numbers as needed between any minimum and maximum. Enabling No Duplicates ensures every number in the list is unique, drawn without replacement. Useful for random sampling, test data or lottery entries.
What lottery formats does this tool support?
Presets are included for Powerball, Mega Millions, EuroMillions, UK Lotto and Lotto NZ. A custom option lets you set any range and pick count for other lottery formats worldwide.
How do lottery quick picks work?
A lottery quick pick is a set of numbers chosen entirely at random by a computer, drawn without replacement. On this tool, quick picks use window.crypto.getRandomValues for cryptographic randomness. Every combination has an equal probability of being generated — the same statistical fairness as the real draw.
How do online random number generators work?
Online random number generators use either a pseudo-random algorithm (like Math.random()) or a cryptographic API (like window.crypto.getRandomValues). This tool uses the cryptographic API, which draws from the operating system's entropy pool — a mix of hardware timing events — to produce results that cannot be predicted or reproduced. All generation happens client-side; no numbers are transmitted to any server.
What is the best free random number generator online?
The strongest free online random number generators use cryptographic randomness rather than basic pseudo-random algorithms. TheRandomNumber.com uses window.crypto.getRandomValues for all results, covering six tools — single number generation, lottery picks, dice rolling, coin flipping, name picking and batch number generation — with no data collection, no sign-up and no cost.
Can I use this for statistics or research?
Yes, for general-purpose sampling and educational use. This tool generates uniformly distributed random integers using a cryptographically secure algorithm, making it suitable for random sampling, probability demonstrations and test dataset generation. For large-scale or security-critical applications, a dedicated statistical software package is recommended.
Does this tool store any of my data?
No. Everything runs entirely in your browser. Nothing is sent to any server, nothing is stored between sessions, and no sign-up or account is required. The names you enter in the Name Picker and the numbers generated all stay on your device.

Key Terms

Random number generator (RNG)
A tool or algorithm that produces numbers with no predictable pattern, where each number in a defined range has an equal probability of being selected on each independent draw.
Cryptographically secure random number generator (CSPRNG)
A random number generator that meets cryptographic security requirements, producing values that are computationally infeasible to predict even with knowledge of previous outputs. This tool uses window.crypto.getRandomValues, the browser's native CSPRNG.
Pseudo-random number generator (PRNG)
A deterministic algorithm that generates sequences of numbers appearing statistically random, but which are reproducible given the same seed value. JavaScript's Math.random() is a PRNG.
Dice notation (NdX)
A shorthand for describing dice rolls: N is the number of dice, X is the number of sides per die. Examples: 1d6 (one six-sided die, range 1–6), 2d10 (two ten-sided dice, range 2–20), 1d20 (one twenty-sided die, range 1–20).
Lottery quick pick
A randomly generated set of lottery numbers produced by a computer algorithm rather than chosen manually. Each number is drawn without replacement, giving every combination an equal probability of being generated.
Fair random selection
A selection process where every candidate has an equal and independent probability of being chosen, with no algorithmic bias toward any particular outcome. All tools on TheRandomNumber.com produce fair random selections.