Are these numbers truly random?

We use the browser's crypto.getRandomValues() method, which provides cryptographically strong pseudo-random numbers. This is much more random and secure than the standard Math.random() used by many other sites.

Can I use this for a lottery or giveaway?

Yes! Because our generator uses cryptographic randomness, it is fair and unbiased, making it perfect for picking winners for contests or raffles.

What is the range limit?

You can generate numbers between -999,999,999 and 999,999,999. The range is limited only by standard integer limits in programming.

Can I generate unique numbers (no duplicates)?

Yes. By default, our tool can produce duplicates (like rolling dice). If you toggle 'No Duplicates', it will ensure every number in the result list is unique (like drawing cards from a deck).

No. The numbers are generated locally on your device and are not stored on our servers. Once you refresh the page, they are gone.

Random Number Generator

Generate truly random numbers within a specific range. Perfect for giveaways, games, and decision making.

Minimum

Maximum

Quantity

Allow Duplicates

Why You Need a Random Number Generator

Humans are terrible at being random. If asked to pick a number between 1 and 10, most people pick 7. If asked to pick a "random" password, we pick patterns.

A Random Number Generator (RNG) removes human bias, ensuring fairness and unpredictability.

🎁 Giveaways & Contests

Fairly select a winner from a list of entries. If you have 500 comments, generate a number between 1 and 500.

🎲 Games & RPGs

Simulate dice rolls (1-6), coin flips (1-2), or complex loot tables for D&D sessions.

🧪 Scientific Sampling

Select random participants for a survey or study to ensure your data is statistically valid.

🔒 Security

Generate temporary PINs, salt values, or initial vectors for basic cryptographic needs.

True Random vs. Pseudo-Random

In the world of computing, there are two types of randomness:

PRNG (Pseudo-Random Number Generator): Uses a mathematical formula (algorithm) to produce a sequence of numbers that looks random. Standard Math.random() is a PRNG. It's fast but predictable if you know the seed.
CSPRNG (Cryptographically Secure PRNG): Uses unpredictable physical entropy (like mouse movements, thermal noise) to seed the generator. It is much harder to predict.

Our Technology: This tool uses crypto.getRandomValues(), which is a CSPRNG. This means the numbers generated here are secure enough for cryptographic use and completely fair for contests.

Unique vs. Repeating Numbers

Understanding the difference is key to getting the result you want:

With Replacement (Repeating)

Like rolling a die multiple times. You can get "6" twice in a row. The probability stays the same for every draw.

Without Replacement (Unique)

Like drawing cards from a deck. Once you draw the Ace of Spades, you can't draw it again. Useful for assigning unique prizes to different people.

Frequently Asked Questions

How do I pick a winner from a list? ▼

1. Number your list of participants (e.g., in Excel, row 1 to 100).
2. Set Min to 1 and Max to 100.
3. Click Generate.
4. The resulting number corresponds to the winning row/person.

Is it possible to predict the next number? ▼

With our tool, no. Because we use the browser's cryptographic API, the numbers are generated based on unpredictable system noise. Even if you knew the previous 1,000 numbers, you could not mathematically predict the next one better than pure chance.

Can I generate negative numbers? ▼

Yes! Just enter a negative value in the "Min" field (e.g., -100) and a positive or negative value in the "Max" field. The generator handles the full range of integers.

Why do I get the same number twice? ▼

True randomness includes clusters. If you flip a coin, getting Heads twice in a row is normal (25% chance). If you want to prevent this, enable the "No Duplicates" option. This forces the generator to pick a new number if it selects one that was already chosen.