Random Number Generator
Generate truly random numbers within any range — instantly, free, no signup.
Quick presets:
About the Random Number Generator
This tool uses the browser's cryptographically secure crypto.getRandomValues() API to produce truly random numbers — not pseudo-random sequences. Results are never predictable or repeatable.
What can I use it for?
Games, lottery simulations, statistical sampling, random decisions, classroom activities, giveaways, and anywhere else you need unbiased random numbers.
Can I generate unique numbers?
Yes — tick "No duplicates" and every number in the list will appear only once. Ideal for lottery picks.
Is there a limit on how many numbers I can generate?
You can generate up to 1,000 numbers at once. With "No duplicates" enabled the quantity cannot exceed the size of your range.
About the Random Number Generator
Our free online random number generator produces truly random numbers within any range you specify. Set a minimum and maximum value, choose how many numbers to generate, and get your results instantly. You can generate a single number for a coin-flip decision, or hundreds of numbers for statistical sampling, classroom exercises, or game development.
The generator uses the browser's built-in cryptographic random number source, which provides high-quality randomness suitable for most purposes including simulations, games, and teaching probability.
Features
- Custom range — Set any minimum and maximum value, from negative numbers to billions.
- Multiple numbers — Generate between 1 and 1000 random numbers in a single click.
- No duplicates option — Enable the unique/no-duplicates setting to generate a set where each number appears only once (like a lottery draw).
- Copy to clipboard — Copy all generated numbers at once for use in spreadsheets, code, or documents.
- History — The last several results are shown so you can compare draws.
Common Uses
- Games and contests — Pick a winner from a numbered list, roll a virtual die, or draw random order for teams.
- Lotteries and draws — Generate lottery numbers within a specified range with no repeats.
- Teaching probability — Demonstrate randomness and probability distributions in classroom settings.
- Statistical sampling — Select random sample indices from a dataset.
- Password seeds — Generate random numbers as seeds or PINs (for low-security use).
- Decision making — Use a range of 1–2 as a digital coin flip, or 1–6 as a virtual die.
- Coding and testing — Generate test data with random values within defined boundaries.
How to Use the Random Number Generator
- Set minimum value — Enter the lowest number in your desired range (default: 1).
- Set maximum value — Enter the highest number in your range (default: 100).
- Set quantity — Choose how many random numbers to generate (1 to 1000).
- Toggle no-duplicates — Enable this if you want each number to appear at most once.
- Click Generate — Your random numbers appear instantly.
- Copy results — Use the copy button to transfer all numbers to your clipboard.
Frequently Asked Questions
Are the numbers truly random?
The generator uses the Web Crypto API's getRandomValues() function, which produces cryptographically strong pseudo-random numbers. For games, statistics, and sampling purposes, this is considered sufficiently random.
Can I generate decimal (floating point) numbers?
Currently the generator produces integers. A decimal mode is planned for a future update.
What is the maximum range I can use?
You can use any integers within JavaScript's safe integer range: from −9,007,199,254,740,991 to 9,007,199,254,740,991.
Is there a limit on how many numbers I can generate?
You can generate up to 1,000 numbers per click. For larger datasets, click Generate multiple times and combine the results.