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Home › Random Number Generator

Random Number Generator

Generate one or many random numbers between any min and max — instantly in your browser.

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Quick Answer

Enter your minimum and maximum values, set the quantity, and click Generate. Numbers are created using your browser's cryptographically secure random generator — no data is sent anywhere.

How random number generators work

This tool uses the Web Crypto API's getRandomValues() method, which generates cryptographically secure pseudo-random numbers. Unlike Math.random(), which uses a deterministic algorithm, this approach draws from the operating system's entropy pool — the same source used for cryptographic keys.

Unique vs. non-unique numbers

When "Unique numbers" is checked, the generator uses a shuffle-based approach to ensure no number appears twice in the output. This requires the range (max − min + 1) to be at least as large as the quantity requested. If you ask for 10 unique numbers between 1 and 5, you'll get an error.

Common uses for random numbers

Random numbers are used everywhere: picking raffle winners, generating lottery numbers, creating random teams or groups, selecting survey participants, running statistical simulations, teaching probability, and seeding games. A good random number generator ensures every value in your range has an equal chance of being chosen.

Frequently asked questions

Is it truly random?

This generator uses your browser's built-in crypto.getRandomValues() function, which produces cryptographically secure pseudo-random numbers. For most purposes — games, raffles, sampling — this is indistinguishable from true randomness.

How do I generate multiple random numbers?

Set the Quantity field to the number of results you want (up to 20). If you also check 'Unique numbers', each result in the list will be different from the others.

Can I generate decimals?

This tool generates whole integers. For decimal (floating-point) random numbers, you can divide any result by a power of 10, e.g. generate a number between 1 and 1000 and divide by 10 to get a decimal between 0.1 and 100.0.

What is a random number generator used for?

Random number generators are used for picking lottery numbers, running raffles, selecting random participants, creating games, statistical sampling, cryptography, simulations, and any scenario where an unbiased random choice is needed.