UUID Generator
Generate UUIDs (Universally Unique Identifiers) online for free. Create version 4 UUIDs instantly. Perfect for development, testing, and unique identifiers.
Generated UUIDs
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is designed to be globally unique. UUIDs are commonly used in software development to uniquely identify information without requiring a central registration authority.
UUID Version 4
This tool generates UUIDs using version 4, which creates random UUIDs. Version 4 UUIDs are generated using random or pseudo-random numbers and have a very low probability of collision, making them suitable for most applications.
Features
- Generate multiple UUIDs at once (1-100)
- Multiple format options (standard, compact, uppercase, braces, URN)
- Optional timestamp inclusion
- Copy individual UUIDs or all at once
- 100% free and browser-based
- Uses cryptographically secure random number generation
Use Cases
- Database primary keys
- API request IDs
- Session identifiers
- File names
- Unique resource identifiers
- Testing and development
FAQ
What is the probability of UUID collision?
The probability of a UUID collision is extremely low. With version 4 UUIDs, you would need to generate approximately 2.71 quintillion UUIDs to have a 50% chance of a collision.
Are the generated UUIDs cryptographically secure?
Yes, this tool uses the Web Crypto API to generate cryptographically secure random values for the UUIDs.
What's the difference between UUID and GUID?
UUID and GUID (Globally Unique Identifier) are essentially the same thing. GUID is Microsoft's implementation of the UUID standard.
Can I use these UUIDs in production?
Yes, the generated UUIDs are suitable for production use. They follow the UUID version 4 specification and use cryptographically secure random number generation.
Do I need to install anything?
No, this tool works directly in your browser. No installation required.