Random Number Generator
Quick Answer
It uses the browser's Crypto.getRandomValues API to generate cryptographically secure random numbers within your specified range.
What Is Random Number Generator?
Random Number Generator is a free online security tools tool that generate random integers, floats or sets with full range control. A random number generator produces one or more random numbers within a range you specify. You set a minimum value, a maximum value, and how many numbers to generate (e.g. 5 random numbers between 1 and 100). The numbers can be integers or decimal values depending on the mode. The generator uses the browser's built-in cryptographically secure random number generator (Crypto.getRandomValues), suitable for most non-security-critical uses. Results are displayed as a list, sorted or unsorted, with or without duplicates. You can copy the output or export it as a comma-separated list. No data is sent anywhere. Unlike many similar tools, it runs entirely in your browser — no data is sent to any server, no account is required, and there are no usage limits. Whether you are a developer, writer, SEO professional, or casual user, this tool provides instant, accurate results without friction.
How to Use Random Number Generator
Set the minimum and maximum values, choose integer or decimal mode, and select how many numbers to generate. Click Generate to see the results.
Key Features
- Customisable range, count, and precision
- Integer or decimal mode
- Toggle duplicates and sorting
- Cryptographically secure randomness (Crypto API)
Common Use Cases
- Picking lottery numbers or raffle winners
- Generating test data with randomised values
- Selecting a random item from a numbered list
Common Mistakes to Avoid
- Forgetting to allow duplicates when generating multiple numbers — if duplicates are off, the count cannot exceed the range size
- Expecting truly unpredictable numbers from any deterministic algorithm — browser Crypto API is suitable for most use cases
- Setting a range that is too small for the requested count (with no duplicates)
Related Topics & Entities
- Random number generation
- Crypto API
- Randomness
Common Questions About Random Number Generator
Related Tools & Resources
- Random Name Generator
- UUID Generator
- Quote Generator
Best Practices for Random Number Generator
To get the most out of Random Number Generator, follow these best practices. Ensure your input data is clean and properly formatted for the most accurate results. Use the copy function to transfer output directly to your clipboard. Bookmark the tool for easy access. Check the related tools section below for complementary utilities that can enhance your workflow. Remember that all processing is client-side, so your data never leaves your browser.
More Security & Validation Tools
Random Number Generator is part of the Security & Validation Tools topic. Explore related tools in this cluster:
Privacy & Security
Random Number Generator processes all data entirely within your browser using JavaScript. No text, files, or personal information is transmitted to any server. Your data stays on your device, making this tool safe for sensitive content. We do not track usage, store inputs, or share data with third parties. The tool works offline after the initial page load and requires no account to use.
Frequently Asked Questions
Find answers to common questions about this tool.