Random Number Generator
Free random number generator with custom range, count, and duplicate control. Uses cryptographic randomness in your browser.
About Random Number Generator
Our Random Number Generator delivers truly random integers in the range you specify. Everything runs in your browser using cryptographic-quality randomness, with nothing sent to a server.
Flexible configuration
Set any minimum and maximum values you like, choose how many numbers you need (up to 100 per batch), and decide whether duplicates are allowed. The tool validates your inputs in real time, so you will know immediately if the range is too small for a unique set of the requested size.
Use cases
Teachers use random numbers to assign group projects or select students for presentations. Game designers use them to prototype mechanics. QA engineers generate random inputs for fuzz testing. Data scientists seed sample datasets. Streamers pick giveaway winners. The applications are endless.
Cryptographic quality
Unlike simple Math.random() calls, this generator uses crypto.getRandomValues, which draws entropy from your operating system's secure random number source. The result is an unbiased, unpredictable sequence that meets the bar for security-sensitive tasks, not just casual use.
If you need random strings rather than numbers, the password generator creates random character sequences with full control over length and character sets. No install needed - just open the page and generate numbers whenever you need them.
Frequently Asked Questions
How are the random numbers generated?
This tool uses the Web Crypto API (crypto.getRandomValues) available in all modern browsers. It produces cryptographically secure random values, meaning the output is suitable not only for games and drawings but also for security-sensitive applications.
Can I generate random numbers without duplicates?
Yes. Toggle the "Allow duplicates" option off and the tool will ensure every number in the result set is unique. Note that when duplicates are disallowed, the count cannot exceed the size of the range (max minus min plus one).
What is the maximum range I can use?
You can set the minimum as low as -1,000,000 and the maximum as high as 1,000,000. You can generate up to 100 numbers per batch.
Is this suitable for lotteries or prize drawings?
The randomness quality is cryptographic-grade, which is stronger than what most lotteries require. However, for official regulated drawings, you may need to use certified hardware random number generators to comply with local laws.