Our Mission
UUIDGen was built with a simple goal: provide developers with a fast, reliable, and privacy-respecting tool for generating universally unique identifiers. Whether you need a single UUID for a configuration file or thousands for a database migration, UUIDGen delivers instantly — no registration, no accounts, no server-side processing.
We believe developer tools should be transparent, free, and respectful of user privacy. Every UUID generated on this site is created entirely within your browser. No identifiers, generation parameters, or usage data are transmitted to our servers or any third party. The tool works even when you are offline.
What Makes UUIDGen Different
UUIDGen is designed to be more than a simple UUID generator. Here's what sets it apart:
- Three UUID versions in one interface — Switch between UUID v1 (time-based), v4 (random), and v7 (time-ordered) with a single tab click. Most generators only support v4.
- Format flexibility — Toggle between uppercase and lowercase, with and without hyphens. Format your UUIDs exactly as your codebase requires, without post-processing.
- Bulk generation with smart display — Generate up to 10,000 UUIDs at once, displayed in a scrollable chip grid. Copy individual UUIDs with a click, batch-copy all with one button, or download as a text file.
- Educational content — Each UUID version comes with a detailed guide explaining the generation algorithm, byte structure, use cases, and frequently asked questions. Learn what each version does and when to use it.
- Cryptographically secure — All random data comes from
crypto.getRandomValues(), the browser's cryptographic random number generator. This is notMath.random()— the output is suitable for security-sensitive applications. - RFC 9562 compliant — Every UUID conforms to the latest specification, with correct version and variant bits. We follow the standard precisely, not approximately.
Technical Details
UUIDGen is a static website built with vanilla HTML, CSS, and JavaScript. There is no server-side component, no database, and no backend framework. The entire application runs in your browser, which means:
- Zero latency — UUID generation is instantaneous because there are no network requests. Even bulk generation of 10,000 UUIDs completes in under a second.
- Complete privacy — Since all computation happens client-side, we physically cannot see or store the UUIDs you generate. Your identifiers never leave your device.
- Offline capable — After the initial page load, the generator works without an internet connection. Bookmark it for offline use.
- No dependencies — The codebase has zero external dependencies. No npm packages, no CDN-hosted libraries, no third-party scripts (except Google AdSense for sustainable operation). This minimizes attack surface and ensures long-term reliability.
The site is hosted on Cloudflare Pages, which provides global CDN distribution, automatic HTTPS, and excellent uptime. The source code is intentionally simple and auditable — you can view it in your browser's developer tools at any time.
Standards Compliance
UUIDGen generates identifiers that conform to RFC 9562 (published May 2024), which supersedes the original RFC 4122. This specification defines the UUID format, version fields, variant bits, and generation algorithms for all UUID versions. Our implementation correctly sets the version nibble and variant bits for v1, v4, and v7, ensuring maximum interoperability with databases, APIs, and validation libraries.
Contact
If you have questions, feedback, or feature requests, please reach out via email at contact@uuidgen.pages.dev. We welcome suggestions for additional UUID versions, format options, or educational content.