Generate secure random numbers, pick from lists, roll dice, create passwords with strength analysis, generate UUIDs, and sample from Gaussian distributions. Uses crypto.getRandomValues.
About this tool
Generate cryptographically secure random numbers. Pick winners from a list. Roll dice. 100% client-side, no upload, free.
What Is the Random Number?
The Random Number is a free browser-based utility tool that performs random number generator calculations instantly without any signup or data upload. All processing runs entirely in your browser using JavaScript — no input data is ever transmitted to a server. The tool handles random picker conversions and calculations with precision, supporting both common and specialized use cases. Unlike online alternatives cluttered with ads and popups, this tool provides a clean, distraction-free interface. It is completely free with no usage limits, no account required, and no data collection.
Who Should Use This Tool?
Everyday users reach for this tool for quick random number generator calculations — splitting restaurant bills, converting recipe measurements, or counting days until an event. Professionals use it for random picker tasks during their workday. Teachers and students use it as an educational reference tool. Travelers rely on it for dice roller conversions on the go. The tool is especially useful on mobile devices where installing a dedicated app for a simple calculation seems excessive. Anyone who needs a fast, reliable answer without wading through ads or creating accounts benefits from this tool.
How to Use the Random Number
Enter your values into the input fields — the tool calculates results instantly as you type, with no submit button needed. For random number generator operations, select your desired units or options from the dropdown menus. The output panel shows results in real time with clear formatting. Use the copy button to transfer results to your clipboard. All processing happens in your browser — close the tab and your data is gone. The tool works offline once the page has loaded, making it reliable even without an internet connection.
Frequently asked
Is the random number generator truly random?
It uses the Web Crypto API's getRandomValues(), which provides cryptographically secure pseudo-random numbers (CSPRNG) drawn from the operating system's entropy pool. This is suitable for security-sensitive applications like generating tokens, lottery draws, or picking contest winners. It is significantly more random than Math.random().
Can I pick a random winner from a list of names?
Yes. Paste a list of names or items (one per line or comma-separated), set the number of winners to pick, and the tool selects them randomly without replacement. This is useful for giveaways, raffle draws, classroom random selection, and A/B test assignment.
Related tools
Why did the fish blush?
No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.
☕Support me on Ko-fi— keep tools free100% of proceeds go towards hosting & building more free tools.