UUID/GUID Generator
Generate unique identifiers (v1, v4) in bulk without duplication
Generation Settings
Practical Use Cases
Generate unique identifiers in bulk for dummy records in development and testing environments.
Quickly generate unique IDs needed for resource creation during REST API testing.
Generate session IDs or token values for authentication system testing.
Create unique filenames without conflicts when developing upload systems.
Frequently Asked Questions
What is UUID v4?▼
UUID (Universally Unique Identifier) v4 is a 128-bit unique identifier generated based on random values. The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where '4' indicates the version and y is one of 8, 9, a, or b.
Is there a chance of UUID collision?▼
Theoretically possible but practically impossible. UUID v4 has about 5.3 x 10^36 combinations, and even generating 1 billion per second would only result in meaningful collision probability after hundreds of years.
What's the difference between GUID and UUID?▼
GUID (Globally Unique Identifier) is a term used by Microsoft, while UUID is the standard name. They are technically identical, with the same generation algorithm and format.
When should I use UUIDs?▼
When unique IDs are needed in distributed systems without central coordination, as database primary keys instead of sequential IDs, and for secure tokens or session IDs.