UUID Generator
Generate unique UUIDs instantly with support for versions 1, 4, and 7. Perfect for database keys, API requests, and unique identifiers. 🔑 Every ID is unique, every time
🔍 What Is a UUID Generator?
A UUID Generator is a tool that creates Universally Unique Identifiers (UUIDs) — 128‑bit labels used to uniquely identify information in computer systems. UUIDs are standardized by the Open Software Foundation and are used in databases, distributed systems, API keys, and anywhere else where unique identifiers are needed. This tool supports versions 1, 4, and 7 of the UUID specification.
◆ This tool processes everything entirely in your browser using the Web Crypto API. No data is ever sent to any server — your IDs stay private and secure.
✨ Key Features
Multiple UUID Versions
Supports v1 (time-based), v4 (random), and v7 (Unix epoch time). Choose the version that fits your use case.
Copy & Copy Raw
Copy the UUID to your clipboard with one click. Use "Copy Raw" to get the UUID without hyphens — perfect for database keys.
UUID Statistics
See the length, version, variant, and a counter of how many UUIDs you've generated. Understand your UUID at a glance.
Instant Regeneration
Generate a new UUID with a single click. No page reloads, no waiting — just click and get a new ID.
Cryptographically Secure
Uses the Web Crypto API for random number generation, ensuring cryptographically secure UUIDs for v4 and v7.
Sample Data
Load a sample UUID with the click of a button to see how the tool works.
💡 Why Use This UUID Generator?
100% Private & Secure
All processing happens directly in your browser using the Web Crypto API. Your UUIDs never leave your device — no uploads, no servers, no tracking.
Works Everywhere
Use it on your phone, tablet, laptop, or desktop. The interface adapts to any screen size.
Instant Feedback
Get results in milliseconds. No page reloads, no waiting — just click and generate.
Completely Free
No sign‑up, no hidden fees, no usage limits. Use it as much as you need.
Accessible & Keyboard‑Friendly
Full keyboard support, visible focus states, and semantic HTML ensure everyone can use the tool effectively.
No Internet Required (After Load)
Once the page loads, the tool works entirely offline using the Web Crypto API. Perfect for secure environments.
📖 How to Use the UUID Generator
- Select a version — click v1, v4, or v7 to choose the UUID version you need.
- Generate a UUID — click the Generate button or press Ctrl+Enter to create a new UUID.
- View the UUID — the generated UUID appears in the display area with its version and variant information.
- Copy — click Copy to copy the UUID to your clipboard, or Copy Raw to copy without hyphens.
- Clear or sample — click Clear to remove the UUID, or Sample to load an example.
💡 Pro tip: Press Ctrl+Enter (or Cmd+Enter on Mac) to generate a new UUID instantly.
🎯 Practical Use Cases
Database Primary Keys
Generate unique primary keys for your database tables. UUIDs are ideal for distributed databases where auto-increment isn't practical.
API Request IDs
Generate unique request IDs for API tracing and debugging. Track requests across microservices with a single identifier.
File & Resource Names
Use UUIDs as unique filenames or resource identifiers to avoid name collisions in distributed systems.
Session & Token Management
Generate session IDs or tokens for user authentication and state management in web applications.
Distributed Systems
Create unique identifiers for events, transactions, and entities in distributed systems without coordination.
Learning & Experimentation
Understand how UUIDs work and the differences between versions by generating and comparing them.
⚠️ Important Notes & Limitations
🔹 Browser-based: Everything runs locally in your browser using the Web Crypto API. No data is stored, transmitted, or shared.
🔹 UUID versions: This tool supports v1 (time-based, uses MAC address and timestamp), v4 (random, cryptographically secure), and v7 (Unix epoch time). v1 and v7 are time-ordered, while v4 is fully random.
🔹 v1 MAC address: v1 UUIDs use a random MAC address (not your actual network MAC) for privacy. The timestamp is based on your system clock.
🔹 Collision probability: v4 UUIDs have a collision probability of approximately 1 in 2^122, making them practically unique for any real-world application.
❓ Frequently Asked Questions
v1 (time-based) uses the current timestamp and a node identifier (MAC address) to generate UUIDs. They are time-ordered and can reveal the creation time. v4 (random) uses cryptographically random numbers and is the most widely used version for its simplicity and security. v7 (Unix epoch) is a newer version that combines a Unix timestamp with random data, offering time-ordered UUIDs with better privacy than v1. For most use cases, v4 is recommended.
Absolutely 100% safe. This tool processes everything in your browser using the Web Crypto API. No data is ever sent to any server, stored, or shared with third parties. Your UUIDs stay on your device.
The probability of a collision with v4 UUIDs is approximately 1 in 2^122 (about 5.3 × 10^36). To put that in perspective, you would need to generate billions of UUIDs per second for billions of years to have a reasonable chance of a collision. For all practical purposes, v4 UUIDs are unique.
Yes! Once the page loads, the tool works entirely offline using the Web Crypto API. You can bookmark it, or save the page (HTML) for offline use. No internet connection is required after the initial load.
Completely free, forever. No sign‑up, no registration, no hidden fees, no usage limits. This tool is proudly offered by GenieDevs as a free resource for everyone.
UUID (Universally Unique Identifier) is the official standard defined by RFC 4122. GUID (Globally Unique Identifier) is Microsoft's implementation of the same standard. They are functionally identical and follow the same format. The terms are often used interchangeably.
👨💻 About the Author — GenieDevs
📦 Get the Standalone Version
🔑 UUID Generator – Standalone Edition
Get the complete, self‑contained HTML version of this tool. Perfect for offline use, intranet deployments, or embedding in your own projects. No dependencies, no external calls — just one HTML file that works anywhere.
🎯 Final Takeaway
The UUID Generator is your go‑to tool for creating unique identifiers quickly and securely.
Whether you're a developer building distributed systems, a database administrator designing schemas, or just need a unique ID for any purpose,
this tool provides reliable, cryptographically secure UUIDs with complete privacy.
✨ Try it right now — choose a version and click Generate.
With its 100% browser‑based architecture using the Web Crypto API, your IDs stay private and secure.
🚀 Share this tool with your fellow developers. Explore our growing collection of free utilities at GenieDevs.
⭐ Bookmark it — you'll be coming back to it again and again.