UUID Generator
Generate random UUIDs (v4) instantly.
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Buy me a coffeeWhat is UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit identifier that's practically guaranteed to be unique across all space and time. UUIDs are used in databases, distributed systems, and applications where you need unique identifiers without a central coordination point. Our generator creates UUID v4 (random) identifiers using your browser's cryptographically secure random number generator.
How to Use UUID Generator
Common Use Cases
- Primary keys for database records
- Unique identifiers for API resources
- Session IDs for web applications
- File naming to avoid collisions
- Tracking IDs for analytics events
Frequently Asked Questions
Are these UUIDs truly unique?
Yes. UUID v4 uses 122 random bits, making collisions virtually impossible. You could generate 1 billion UUIDs per second for 100 years and have less than a 50% chance of a single collision.
What's the difference between UUID and GUID?
They're the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID. Both refer to the same 128-bit identifier format.
What UUID version does this generate?
This tool generates UUID v4 (random). Other versions exist (v1 uses timestamp, v5 uses namespace hashing), but v4 is most common for general-purpose unique IDs.