Free Online UUID Generator
Quickly generate UUID v4 and v1, with batch and custom format support and one-click copy. Generated locally in your browser.
Key Features
v4 / v1 Versions
Supports random (v4) and time-based (v1) UUIDs, covering different use cases.
Batch Generation
Generate 1β100 UUIDs at once, perfect for test data and bulk table seeding.
Custom Format
Choose uppercase/lowercase and with or without hyphens to match different system requirements.
Local Generation
Generated locally with cryptographically secure randomness β UUIDs never leave the browser, protecting your privacy.
How to Use
Choose Version & Format
Pick UUID v4 or v1, and set the quantity, case, and whether to include hyphens.
Click Generate
Click Generate to instantly get the UUID list you need.
Copy & Use
Copy the whole list to the clipboard in one click, or copy individually for your project.
Frequently Asked Questions
What is the difference between UUID and GUID?
They are essentially the same. UUID is the international standard format (RFC 4122), and GUID is Microsoft's name for the same standard. They are interchangeable.
Will generated UUIDs ever collide?
Almost never. UUID v4 has 122 bits of randomness, so the collision probability is extremely low and safe for everyday development.
How do I choose between UUID v1 and v4?
Use v1 (timestamp-based) when you need sortable, traceable generation time; use v4 when you only need random uniqueness. Both are widely compatible.
Are UUIDs saved on the server?
No. Generation happens entirely in your browser β no data is uploaded or recorded.