Random Number Generator

Generate a random integer between any two numbers

Range
Result
—

🔧 Related Tools

What is a Random Number Generator?

A random number generator (RNG) is a tool that produces a number that cannot be reasonably predicted better than by random chance. Our generator uses the crypto.getRandomValues() method, which provides cryptographically secure random numbers. This means the output is unbiased and suitable for applications where true randomness matters, such as giveaways, gaming, simulations, or selecting winners.

You can set any integer range – from negative to positive, small to large – and the generator will produce a uniformly distributed integer within that range.

How It Works

The generator works by:

  • Taking your minimum and maximum values.
  • Calculating the range (max - min + 1).
  • Using a cryptographically secure random function to pick a number between 0 and 1.
  • Mapping that onto the desired range and rounding to an integer.

Because it uses true randomness (from the browser’s crypto API), each result is independent and equally likely.

Common Use Cases

  • Giveaways & Contests: Pick a random winner from a list of participants.
  • Gaming: Generate random loot drops, enemy encounters, or character stats.
  • Education: Create random math problems or sampling for experiments.
  • Decision Making: Flip a coin, roll dice, or pick a random option when choices are equal.
  • Programming: Test algorithms with random data.

Because the generator is browser‑based, you can use it offline, and it never sends data over the internet.

Frequently Asked Questions

How random is this generator?
It uses the browser's built‑in crypto.getRandomValues(), which is a cryptographically secure pseudorandom number generator. It is suitable for most applications requiring true randomness, including security‑sensitive contexts.
Can I generate negative numbers?
Yes! Simply enter a negative minimum (e.g., -50) and a positive maximum (e.g., 50). The generator will return an integer between them.
What is the maximum range?
You can generate numbers between -2³¹ and 2³¹-1 (roughly ±2.1 billion). The tool will warn you if your range is too large, but most uses will fit comfortably.
Is it truly random?
True randomness is impossible to achieve with a deterministic computer, but crypto.getRandomValues() draws from a high‑entropy source and is considered cryptographically secure. For most practical purposes, it is effectively random.
Can I generate decimals instead of integers?
Currently this tool generates integers only. For decimals, you can use our “Random Decimal Generator” (coming soon) or simply divide the result by a power of 10.