Random Number Generator

How random number generation works here

This generator uses your browser's built-in pseudo-random number source (JavaScript's Math.random) to produce values evenly distributed across the range you set. For whole numbers it maps the random value onto every integer between your minimum and maximum inclusively, and for decimals it keeps two decimal places for readability while still covering the full range uniformly.

The "unique numbers only" option is useful for tasks like drawing raffle winners, shuffling a small list, or picking non-repeating quiz questions — the generator keeps rejecting duplicates until it has enough unique values, and it will stop automatically once it has exhausted every possible integer in a small range so it never runs forever. Without that option, numbers can repeat, which better simulates independent random events like dice rolls or lottery-style draws where repetition is expected.

It's worth being clear about what this tool is not: Math.random() is a pseudo-random generator suitable for games, sampling, classroom demonstrations, and everyday decision-making, but it is not cryptographically secure. Don't use it to generate passwords, encryption keys, security tokens, or anything where an attacker predicting the sequence would cause real harm — those use cases need a cryptographic random source instead. For everyday "pick a number," "who goes first," or "randomly select a name from a list" needs, this generator is fast, private (nothing leaves your browser), and easy to repeat as many times as you like.

Frequently asked questions

Is this good enough for a raffle or giveaway? For casual, low-stakes drawings, yes — it uses your browser's built-in random number source, which is more than sufficient for picking a name from a hat or deciding who goes first in a game.

Can I generate numbers without repeats? Yes, enable the "no duplicates" option when generating multiple numbers at once, useful for things like drawing multiple raffle winners or shuffling a small list.

Is this suitable for cryptography or security purposes? No — this tool is designed for everyday randomness like games, raffles, and sampling, not for generating passwords, encryption keys, or anything with real security requirements.

Good to know

This tool uses your browser’s built-in random function to pick a whole number between the minimum and maximum you set, with every number in that range having an equal chance of appearing. It’s commonly used for raffle draws, picking a winner from a list, assigning random teams, or generating test data for a spreadsheet.

Is this truly random or “pseudo-random”? Like virtually all software random number generators, it's pseudo-random — statistically indistinguishable from true randomness for everyday use, though not suitable for cryptographic security keys.

Can I generate multiple numbers without repeats? Run the generator once per pick, and if you don't want previous numbers to repeat, simply set your next minimum/maximum range to exclude values you've already drawn, or note results as you go.