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100% free · no signupNo sign-upRuns in your browser

Random Number Generator

Generate random integers in any range, with an option for unique (no-repeat) numbers.

Best for: Use it to pick lottery-style numbers, choose a random winner, sample rows for a spot check, seed a game, or make an impartial choice.

Purpose: Generate random integers in any range, with an option for unique (no-repeat) numbers.

Complete guide
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Input

How it's calculated & sources
The Random Number Generator uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Each value is a uniform random integer in [min, max]. With unique on, values are drawn without repeats (the range must be at least as large as the count).

Example

Range 1–100, 5 numbers → e.g. 7, 42, 13, 88, 61.

Frequently asked questions

Is this good enough for a giveaway or draw?+

Yes for casual draws and picks. It is pseudo-random from your browser, so it is not intended for cryptography, security keys or gambling-critical use.

Why can't I get unique numbers sometimes?+

Unique mode draws without repeats, so the range has to contain at least as many values as you request — you cannot pick 10 unique numbers from 1–5.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Random Number?
A random number generator produces one or more random integers within a range you choose, with an option to make them unique (no repeats) - useful for draws, sampling, games and testing.
Why does Random Number matter?
The output is a fresh random set each time you generate. It is pseudo-random (from your device), which is fine for everyday use but not for cryptography or security-sensitive purposes.
How is Random Number calculated?
Each number is drawn uniformly from your minimum-to-maximum range so every value is equally likely. With unique enabled it draws without replacement, like pulling numbered balls from a bag. Formula: value = min + floor(random x (max - min + 1)).
What is a good random number?
For unique results the range must be at least as large as how many numbers you want - you cannot draw 10 unique values from 1-5.
What are common random number mistakes?
Expecting cryptographic randomness - use a dedicated secure generator for passwords or keys.
When should you use the Random Number Generator?
Use it to pick lottery-style numbers, choose a random winner, sample rows for a spot check, seed a game, or make an impartial choice.

What is the Random Number Generator?

A random number generator produces one or more random integers within a range you choose, with an option to make them unique (no repeats) - useful for draws, sampling, games and testing.

How the Random Number Generator works

Each number is drawn uniformly from your minimum-to-maximum range so every value is equally likely. With unique enabled it draws without replacement, like pulling numbered balls from a bag.

value = min + floor(random x (max - min + 1))

What's a typical value?

For unique results the range must be at least as large as how many numbers you want - you cannot draw 10 unique values from 1-5.

Worked example

Range 1-100, 5 numbers, unique -> e.g. 7, 42, 13, 88, 61 (no repeats).

Common mistakes to avoid

  • Expecting cryptographic randomness - use a dedicated secure generator for passwords or keys.
  • Requesting more unique numbers than the range allows.
  • Assuming past draws affect future ones - each generation is independent.

Keywords: random, number, generator, rng, pick.

Output is pseudo-random, suitable for casual use - not for security, cryptography or gambling-critical purposes.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Random Number Generator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Random Number Generator?+

Random Number Generator uses the standard random number formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Random Number Generator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Random Number Generator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Reddit post
Title: I built/used this free random number generator — instant, no signup

Body: Generate random integers in any range, with an option for unique (no-repeat) numbers. Try it: https://freetoolsgalaxy.com/tools/random-number-generator
LinkedIn post
Random Number Generator on Free Tools Galaxy — Generate random integers in any range, with an option for unique (no-repeat) numbers. https://freetoolsgalaxy.com/tools/random-number-generator
Medium intro
# Random Number Generator — the free tool I keep coming back to

Generate random integers in any range, with an option for unique (no-repeat) numbers.

Try it: https://freetoolsgalaxy.com/tools/random-number-generator
Quora answer
The fastest way is to use a free in-browser random number generator: https://freetoolsgalaxy.com/tools/random-number-generator. Generate random integers in any range, with an option for unique (no-repeat) numbers.

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HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/random-number-generator?embed=1" title="Random Number Generator" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/random-number-generator" target="_blank" rel="noopener">Powered by Random Number Generator on Free Tools Galaxy</a></p>
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<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/random-number-generator?embed=1" title="Random Number Generator" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
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Paste in a custom-HTML block or markdown file.
[Random Number Generator — free online tool](https://freetoolsgalaxy.com/tools/random-number-generator)

<iframe src="https://freetoolsgalaxy.com/tools/random-number-generator?embed=1" width="100%" height="600" frameborder="0"></iframe>
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<a href="https://freetoolsgalaxy.com/tools/random-number-generator" target="_blank" rel="noopener">Try the free Random Number Generator</a>

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Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free random number generator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick random number generator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard random number use cases (random, number, generator, rng) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/random-number-generator

Happy to take feedback — what's missing?
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