What is UUIDGen?
UUIDGen is a free online tool for generating and validating UUIDs (Universally Unique Identifiers). It supports UUID v4 (random), v1 (timestamp-based), v7 (time-ordered, the modern standard), and the Nil UUID - covering the full range of versions developers actually use.
Every UUID is generated directly in your browser using the Web Crypto API
(crypto.randomUUID()). Nothing is sent to a server, nothing is logged.
The tool is designed to be fast, clean, and completely private.
Why it exists
Most UUID generators online are slow, cluttered with ads above the tool, or don't support newer versions like UUID v7. UUIDGen was built to fix that - a clean tool that loads instantly, respects developer preferences, and provides genuinely useful educational content alongside the generator.
The site covers the full developer workflow: generate UUIDs in bulk, validate existing ones with detailed explanations, and learn the technical differences between versions through code examples in JavaScript, Python, Go, Java, and PHP.
Who built it
UUIDGen was built and is maintained by Akshay Deshmukh.
Have feedback, a bug report, or a feature request? Get in touch.
Technology
UUIDGen is built with plain HTML, CSS, and vanilla JavaScript - no frameworks, no build tools. This keeps the page lightweight, fast to load, and easy to maintain. UUID generation uses:
- v4:
crypto.randomUUID()- the native Web Crypto API (zero dependencies) - v1 and v7: the uuid open-source library by uuidjs, loaded from the jsDelivr CDN
The site is hosted on Vercel with automatic HTTPS and global CDN delivery.
Privacy
No user data is collected, stored, or shared. Generation history uses your browser's
localStorage and never leaves your device. Advertising is served by
Google AdSense; see the Privacy Policy for details on
cookie usage.