How is randomness produced?

Each number is drawn from crypto.getRandomValues with rejection sampling, eliminating the modulo bias that affects naive implementations.

What's the maximum range?

The tool handles ranges up to roughly 4.2 billion (the Uint32 limit). For practical use, ranges in the millions work instantly.

What does “Unique only” do?

It guarantees no value appears twice in the result. If you request more unique numbers than the range contains, the count is automatically clamped.

Can I generate lottery numbers?

Yes — set the range (e.g. 1–49), request 6 numbers, and toggle Unique + Sort for a clean lottery-style draw.

How many numbers can I generate at once?

Up to 10,000 per click. Results above 200 are shown in a scrollable text block to keep the page responsive.

Are these numbers safe for passwords or tokens?

Yes — they're cryptographically secure. For passwords, prefer a dedicated password generator from the Security suite, but the entropy source here is identical.

Random Number Generator

Generate cryptographically random integers — unique or repeating.

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See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Random Number Generator

Follow these steps — everything happens instantly in your browser.

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Step 1. Enter the minimum and maximum values for your range.
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Step 2. Set how many numbers to generate.
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Step 3. Toggle “Unique only” to prevent repeats and “Sort ascending” to order results.
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Step 4. Click “Generate” — copy individual numbers or all of them at once.