M ToolsMio

Random Number Generator

Generate random numbers in any range, with or without repeats. Pick a number between 1 and 100, roll dice, or pick lottery numbers - free and private.

Quick presets
Click Generate to get your random numbers

Powered by the Web Crypto API - cryptographically secure randomness.

Features

100% Browser-Based

All numbers are generated in your browser. Your settings and results never leave your device.

Free & No Sign Up

No registration, no limits, no hidden fees.

Instant Results

Generate up to 1,000 numbers in any range in real time - zero waiting.

Cryptographically Secure

Numbers come from the Web Crypto API, the same cryptographic source used for passwords - not the predictable Math.random().

No Duplicates, Sorting & Presets

Generate unique numbers without repeats, sort them ascending, or use one-click presets for dice, coin flips, and lottery picks.

How to Generate Random Numbers?

  1. Enter the Minimum and Maximum values of your range - for example 1 and 100.
  2. Set how many numbers you need, from a single pick up to 1,000.
  3. Optionally enable "No duplicates" to draw without repeats, and "Sort results" to order them.
  4. Click Generate - or use a quick preset for dice, coin flips, or lottery numbers.
  5. Click Copy to grab the numbers, or Download to save them as a text file.

Common Use Cases

Lotteries & Giveaways

Draw winning tickets or raffle numbers fairly. Use "No duplicates" so the same ticket can't win twice, and sort the results for easy reading.

Games & Tabletop

Roll dice (1-6 or any custom die), flip a coin (1-2), or generate damage rolls for tabletop RPGs - with cryptographic fairness.

Sampling & Statistics

Pick random sample IDs from a numbered population for surveys, audits, or experiments. Rejection sampling keeps every ID equally likely.

Classroom & Decisions

Pick a random student, choose who goes first, or settle a friendly dispute - quick, unbiased, and visible to everyone.

Tips for Using a Random Number Generator

Frequently Asked Questions

Is this random number generator truly random?
It is as close to truly random as software can get. The tool uses the Web Crypto API (crypto.getRandomValues), a cryptographically secure random number generator (CSPRNG) built into your browser and seeded by the operating system's entropy pool. This is the same source browsers use for encryption keys. It passes statistical randomness tests and is far less predictable than Math.random(), which is designed for speed rather than security. For fairness-critical uses such as giveaways or lotteries, always prefer a cryptographic source like this one.
Can I generate random numbers without duplicates?
Yes. Turn on the "No duplicates" option and every number in your results will be different. The tool draws without replacement, like pulling numbered balls from a bag, so each possible number can appear at most once. If you ask for more unique numbers than the range contains (for example 10 unique numbers between 1 and 6), you will get a clear error explaining the limit.
How do I pick a random number between 1 and 100?
Set Minimum to 1 and Maximum to 100, leave the quantity at 1, and click Generate. Every number from 1 to 100 has exactly the same probability of being picked. To pick several winners at once, increase the quantity - and enable "No duplicates" if each entry should only win once. The same steps work for any range, including 1-10, 1-6 for dice, or negative ranges like -50 to 50.
Can I use it to pick lottery numbers?
Yes. Enable "No duplicates" and "Sort results", set the range to match your lottery (for example 1-49), and generate as many numbers as you need, such as 6. The one-click lottery preset does exactly this. The tool is cryptographically fair, which makes it popular for raffles, giveaways, and classroom draws as well. Keep in mind that lottery draws are independent events - no number combination is more likely than any other.
Is my data sent to any server?
No. All generation happens entirely in your browser using the Web Crypto API - there is no server involved at all. Nothing you type or generate is ever transmitted, stored, or logged anywhere outside your device. You can verify this yourself by opening the browser DevTools Network tab while generating numbers: you will see zero outbound requests. Even your settings are only saved locally in your own browser for convenience.

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