Random Number Generator

Generates random numbers within a defined range using selectable distributions, with optional seed for reproducibility, targeted at developers, QA, and data scientists.

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1,028+
Total Calculations Run
< 15ms
Browser Execution Speed
100%
Client-Side Privacy
4.9 / 5.0
User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Random Number Generator processes input data instantly inside your browser.

Sample Input Options list: ["Emma", "Liam", "Noah", "Olivia", "Sophia"]
Computed Result Selected: Liam (Verifiably random selection)
Execution Mode Client-Side In-Browser JS
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About This Tool

Generates random numbers within a user-specified range using selectable distributions. Conceptually, a seeded PRNG produces a sequence of numbers that map to the desired domain. For uniform distribution, values fall evenly across [min, max); for normal distribution, values cluster around the mean with defined stddev. The tool is useful for testing, simulations, data sampling, and educational demonstrations. Users can specify a seed for reproducibility, choose distribution type, and control output size. Core value lies in the balance of simplicity, speed, and deterministic results when a seed is provided, plus the flexibility to switch distributions without scripting. Use cases include creating mock datasets, stress testing input handling, and validating statistical workflows. Core features include batch generation, numeric formatting, and easy export of results for analysis and reproducibility.

How to Use

Provide inputs: min, max, count, distribution; optional: seed, mean, stddev. Choose distribution: uniform or normal. Run calculation: generate the requested count of numbers. Review outputs: array of generated numbers with formatting rules. Export or copy: save results as JSON or paste into scripts. Validate reproducibility by re-running with the same seed.

How to use random number generator online

Frequently Asked Questions

Find Quick Answers

What distributions are supported?
Supported distributions are uniform and normal. Uniform distributes values evenly across the range; normal centers around the mean with the specified standard deviation. For normal, mean and stddev must be provided.
Can results be reproduced?
Yes. If a seed is provided, the same inputs yield identical outputs across runs. Without a seed, results vary because the generator uses a time-based or non-deterministic seed.
What input validations occur?
Inputs are validated for logical consistency: min <= max, count > 0, distribution is recognized. For normal, mean and stddev are required. If invalid, an explicit error is returned.
How large can the generated set be?
The tool supports large counts, but extremely large outputs may require batching or streaming to manage memory. Consider generating in chunks for very large datasets.

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