What is Random Number Generator?

Random Number Generator uses your device's cryptographic engine to produce random numbers. Set a range and generate one or many numbers for lotteries, games, statistical sampling, or decision-making.

Set a minimum and maximum, pick how many numbers you need (up to 1,000 per draw), and choose whether duplicates are allowed. Switch between integer and decimal mode, narrow integer draws to odd-only or even-only values, exclude specific numbers, then copy or download the result as a plain-text file. The generator pulls entropy from crypto.getRandomValues — the operating system's cryptographic source, the same one used to seed TLS keys — so every draw is genuinely unpredictable rather than the cyclic output of Math.random.

How to use

1. Step 1 — Set the minimum and maximum values for your range.
2. Step 2 — Choose how many random numbers to generate at once.
3. Step 3 — Click generate and copy the results. Regenerate anytime for fresh numbers.

When to use

• Drawing lottery picks or weekly office-pool numbers in the 1–49 or 1–69 range.
• Generating a 4-digit PIN or a 6-digit code for testing without using real customer data.
• Picking statistical sample IDs from a dataset where every row has a unique integer key.

Result

Generate 6 unique random numbers between 1 and 49 for your weekly lottery ticket selection.

FAQ

Is this really random, or just shuffled pseudo-random?

It uses crypto.getRandomValues, which pulls entropy from the operating system's CSPRNG — the same source used to seed TLS keys. That's a cryptographically secure random source, far stronger than the deterministic Math.random function.

What's the difference between unique and non-unique numbers?

With unique mode, every drawn number is removed from the pool so no value can repeat in the same result — right for lottery picks. Without it, each draw is independent, so duplicates are possible — better for dice rolls or sampling with replacement.

What's the largest number range I can use?

The min and max accept any integer JavaScript can represent (roughly −9 × 10¹⁵ to 9 × 10¹⁵). At that scale though the input fields get unwieldy; for ranges over a few billion, expect to type carefully.

Why does unique mode error out for some ranges?

You can't pick 10 unique numbers from the range 1–5 — there aren't enough values. The tool blocks that case and tells you. Either widen the range, lower the quantity, or turn unique mode off.

Can I use these numbers for anything security-sensitive?

For small things like contest picks, test PINs, or PIN-style codes, yes — the source is cryptographic. For real passwords or encryption keys, use a password manager that handles length and character classes correctly. This tool produces integers or fixed-precision decimals only, never strings or mixed alphanumerics.

Related Tools