How do I generate a random number?
A random integer generator for any min-max range. You can generate one number or up to 1000 at once, optionally without duplicates and pre-sorted.
Under the hood it uses the Web Crypto API: the real randomness used in security, not the basic `Math.random`. That makes the results genuinely unpredictable, suitable for raffles, games, statistics.
How to use it
- Set min and max: the range (inclusive on both ends).
- Enter the count of numbers to generate (1-1000).
- Unique (toggle), forces every result to be different. Requires a range larger than the count.
- Sorted (toggle), orders the result from smallest to largest.
- Click "Generate": results show as tiles. "Copy" saves them as a comma-separated list.
When this is useful
The most common uses:
- Picking a contest winner: 100 people entered, pick 1. Range 1-100, count 1, click "Generate". Add "unique" if you draw multiple places (e.g. 3 of 100).
- Lottery-style numbers: 6 unique sorted numbers from 1-49 = classic lottery picks. Enable both "unique" and "sorted".
- Dice roll: range 1-6, count 1. Or two dice, range 1-6, count 2.
- "Which movie tonight?": number the list, draw a number. Discussion over.
- Test data for software: a thousand unique IDs from 1-9999 for a database test. Tick "unique", count 1000.
- Education, statistics and probability: generate 100 dice rolls and check whether the distribution is even. Useful for teaching the law of large numbers.
- Everyday decisions: "coffee or tea?" → range 0-1. "Restaurant A, B, or C?" → range 1-3.
Questions and answers
Yes. The generator uses the Web Crypto API (crypto.getRandomValues), the same mechanism used to generate encryption keys and passwords. Results are cryptographically unpredictable. The simpler Math.random() used by many basic web tools is "pseudo-random", it starts from a seed and deterministically produces the next numbers. Our generator is much stronger.