Random Number Generator
Generate random numbers online for free. Set min, max, and count. Supports unique (non-repeating) numbers.
About Random Number Generator
This tool generates random integers within a specified range using the browser's cryptographically-seeded Math.random() function. You can generate a single number or up to 100 numbers at once. The 'no duplicates' option uses a Fisher-Yates shuffle to ensure all generated numbers are unique — useful for lotteries, sampling, or assigning random IDs. Random number generators are used in games, statistics, cryptography, simulations, and more.
FAQ
- How are the random numbers generated?
- Numbers are generated using JavaScript's Math.random(), which produces uniformly distributed pseudo-random numbers. For unique numbers, a Fisher-Yates shuffle is applied to a pool of all possible values in the range.
- What does 'no duplicates' mean?
- When enabled, each generated number appears only once in the results. For example, generating 5 unique numbers between 1 and 10 guarantees no repeated values.
- Can I use this as a lottery number picker?
- Yes! Set the minimum and maximum to match your lottery range (e.g., 1 to 45), set the count to the number of balls drawn, and enable 'no duplicates' for a fair draw.
- What is the maximum count?
- You can generate up to 100 numbers at once. For unique numbers, the count cannot exceed the total numbers available in your range (max − min + 1).
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