Random Number Generator

Generate random integers within any range — one at a time or in bulk, with or without duplicates.

About This Random Number Generator

This free online random number generator creates truly random integers within any range you specify. Set a minimum value, a maximum value, and how many numbers you want. Toggle “no duplicates” to get a unique set of numbers — useful for lotteries, giveaways, and sampling without replacement.

The generator uses JavaScript's Math.random() function, which is a pseudorandom number generator (PRNG) suitable for games, decisions, sampling, and any non-cryptographic use case. All generation happens in your browser — nothing is sent to a server.

Common Uses

  • Games and dice: Roll a virtual die (1–6), draw a random card number, or simulate any dice combination.
  • Giveaways and contests: Pick a random winner number from a list of entries.
  • Decisions: Can't choose? Let random pick for you — just use 1 to the number of options.
  • Statistics and sampling: Generate random sample indices from a dataset.
  • Education: Create random math problems, quiz order randomization, or lottery simulations.
  • PIN generation: Generate a random 4-digit number (1000–9999) for a test PIN.

How the No-Duplicate Mode Works

When “no duplicate numbers” is enabled, the generator uses a Fisher-Yates shuffle on the full range of possible values, then takes the first N results. This guarantees a uniform distribution with no repeats — the same algorithm used in proper lottery draws. The maximum count you can request is limited to the size of the range (max − min + 1).

Generating Multiple Numbers

Set Count to more than 1 to generate a batch. The tool displays all numbers and also shows the sum and average of the batch — handy for statistical exercises. You can generate up to 1,000 numbers at once.

Frequently Asked Questions

Is this truly random?
It uses a pseudorandom number generator — the same quality as used in games and simulations. It is not cryptographically secure, but is perfectly random for everyday purposes.
Can I generate negative numbers?
Yes. Set Min to a negative value (e.g., -100) and Max to any value above it.
What is the maximum range?
The range can be as large as JavaScript's safe integer limit (±9 quadrillion), but for practical use keep it reasonable.