Utility Tools
Random Number Generator — Integer Range with Math.random
Generate random integers free between any min and max, up to 100 numbers at once. Uses Math.random — not UUIDs or crypto. Set your range and generate now.
Random Number Generator on FYN Tools is a free Utility Tools utility. Open Random Number Generator in your browser — no signup required. Set a minimum and maximum integer (min must be less than max), choose how many numbers to generate (1–100), click Generate, and get a comma-separated list of integers produced by Math.floor(Math.random()) — not UUIDs and not cryptographically secure. Related: Dice Roller.
Privacy & processing: 100% client-side browser processing — integers are generated with Math.random locally. This is not a UUID generator and not suitable for security-sensitive randomness.
TL;DR: Set a minimum and maximum integer (min must be less than max), choose how many numbers to generate (1–100), click Generate, and get a comma-separated list of integers produced by Math.floor(Math.random()) — not UUIDs and not cryptographically secure.
Reviewed by FYN Tools Editorial · Guides ·
Data input / output
| Inputs | Minimum integer, maximum integer, and count (1–100) |
|---|---|
| Outputs | Comma-separated list of random integers within the inclusive range |
| Formats | Plain decimal integers displayed and copyable as text |
| Limits | Minimum must be strictly less than maximum; count capped at 100; uses Math.random (not crypto.getRandomValues) |
| Processing | Client-side (browser Math.random) |
How to Use the Random Number Generator
- Enter the Minimum Value for your desired range.
- Enter the Maximum Value (must be greater than minimum).
- Set Count between 1 and 100 for how many numbers to draw.
- Click Generate Random Numbers.
- Review the comma-separated list in the output panel.
- Click Copy to copy all generated numbers to the clipboard.
What is a Random Number Generator?
Enter a minimum value, maximum value, and how many numbers you want. Each result is Math.floor(Math.random() * (max - min + 1)) + min, giving inclusive integers across your range. Generate up to 100 numbers in one click and copy the list.
This tool generates random integers only — it does not produce UUIDs, GUIDs, or cryptographically secure values. If min is greater than or equal to max, the UI shows an Invalid Range error and does not generate.
On each Generate click, a loop runs count times, pushing one random integer per iteration into an array. Results render as a monospace comma-separated string with a copy button. No history or seed control is exposed.
How it works
You set generate random numbers in the live panel. Random Number Generator then generate random numbers within a specified range. Results show as result from random number generator you can copy or download.
For random character strings, see our Password Generator.
Usage scenarios
- Raffle draw: Set min 1 and max 500, count 1, to pick one winning ticket number.
- Test data batch: Generate 50 random integers between 0 and 999 for spreadsheet or API mock tests.
- Game turn order: Assign each player a random number in a range to determine turn sequence.
Input / Output Examples
Input
Range: 1–100 | Count: 5 | Mode: Integer
Output
23, 87, 4, 56, 71
Frequently Asked Questions
How random are the generated numbers?+
Our generator uses JavaScript's built-in cryptographically secure random number generator, providing truly random numbers suitable for most applications including games and research.
Can I generate negative numbers?+
Yes, you can set negative minimum values to generate negative numbers. For example, set min to -100 and max to 100 to generate numbers between -100 and 100.
Is there a limit to how many numbers I can generate?+
You can generate up to 1000 numbers at once. For larger datasets, simply run the generator multiple times.
Can I generate decimal numbers?+
Yes, our generator supports decimal numbers. You can specify the number of decimal places you want in your random numbers.
Are the numbers suitable for cryptographic purposes?+
While our generator uses secure random functions, for cryptographic applications requiring high security, we recommend using specialized cryptographic libraries.
Key Features
- Minimum and maximum integer inputs
- Count selector (1–100)
- Math.random integer generation
- Comma-separated output with copy button
- Invalid range validation
Benefits
Pick random integers without a spreadsheet formula.
Generate batches for testing or games in seconds.
No signup or server round-trip.
When to Use Random Number Generator
- Picking a random integer for a game, raffle, or classroom activity
- Generating several random values within a known range for testing
- Quick dice-style rolls when you need more than one number at once
- Prototyping apps that need sample numeric data in a range
Advantages
- Simple min, max, and count controls
- Up to 100 numbers per generation
- One-click copy of the full result list
- Instant client-side generation
Tips
- Ensure minimum is strictly less than maximum before generating.
- Use count up to 100 when you need many samples in one batch.
- Do not use Math.random output for passwords, tokens, or lottery security.
- Copy the full list immediately if you need to paste into a spreadsheet.
Common Mistakes
Setting min equal to or greater than max — generation is blocked with an error toast.
Expecting UUID v4 strings — this tool outputs integers only.
Assuming cryptographic quality — Math.random is not secure for secrets.
Entering count above 100 — the input enforces a max of 100.
Summary
Set min, max, and count, click Generate, and copy up to 100 random integers from Math.random — honest integer output, not UUIDs or crypto-grade randomness.