What We Do
Random-numbers.com is a collection of free online tools for generating random values. Whether you need a secure random number, dice rolls for tabletop gaming, a coin flip, or unique identifiers, we provide fast, reliable, and cryptographically secure options.
All tools work directly in your browser using the Web Crypto API, ensuring your randomness is generated securely without sending any data to our servers.
Our Tools
- Random Number Generator: Generate secure random numbers in custom ranges
- D&D Dice Roller: Roll tabletop dice (d4, d6, d8, d10, d12, d20, d100) with support for multiple dice
- Coin Flip: Simple heads or tails random choice
- Cat Generator: Generate a random cat breed and coat color combination for fun, prompts, and creative ideas
- Dog Generator: Generate a random dog breed and coat color combination for fun, prompts, and creative ideas
- UUID Generator: Create version 4 UUIDs for development and testing
- Entropy as Pixels: Visualize raw entropy bytes as colored pixels and hexadecimal values
- Password Generator: Create cryptographically secure passwords with customizable character sets and entropy analysis
- Hash Generator: Generate secure SHA-256, SHA-384, and SHA-512 digests for text and files directly in the browser
- JSON Formatter: Format, validate, minify, copy, and download strict JSON directly in the browser
Security & Randomness
Unlike many online random generators that use
Math.random(), our tools use the browser's
cryptographic random number generator. This provides true randomness
sourced from your operating system's entropy pool, suitable for
games, simulations, security, and testing.
We implement rejection sampling to ensure uniform distribution and avoid statistical bias, even for large ranges or multiple dice rolls.
Why Browser-Based?
By generating randomness in your browser, we eliminate server-side processing and data transmission. Your random values are created locally, maintaining privacy and reducing latency. This approach also works offline once the page is loaded.
The tools are designed to be fast, accessible, and work across modern browsers without requiring plugins or downloads.
Open Source & Transparency
The code behind these tools is built with standard web technologies (HTML, CSS, JavaScript) and follows best practices for security and usability. While the source code is not currently open source, the algorithms and methods used are well-documented and based on established cryptographic principles.
Contact & Feedback
This site is maintained by developers who value privacy and security. If you have questions, suggestions, or feedback about the tools, you can reach us through our privacy policy contact information.
We aim to keep the site simple, fast, and focused on providing reliable random generation tools for developers, gamers, and anyone who needs trustworthy randomness.
Advertising and Support
This site is free to use, and we keep it that way through advertising partnerships. We use Propeller Ads to display advertisements that help fund the development and maintenance of these random generation tools.
We are committed to transparency about our advertising practices. All advertising is handled through legitimate, reputable advertising networks. For detailed information about how advertising works on this site and how your data may be used for ad serving, please visit our privacy policy.
Propeller Ads is a professional advertising network that complies with industry standards and regulations. Advertising helps us maintain a free service without charging users for access to these tools.