UUID Generator
Generate unique UUID v4 and output in various formats
Generation Settings
Standard
About UUID
- UUID v4: A randomly generated 128-bit unique identifier
- Usage: Database primary keys, session IDs, file names, etc.
- Collision probability: Extremely low, practically considered unique
- Format: 36 characters in 8-4-4-4-12 format (including hyphens)
* This tool uses the browser's standard crypto API to securely generate UUIDs.
About this tool
The UUID Generator produces RFC 4122 version 4 universally unique identifiers using cryptographically strong randomness. Each click yields a fresh value that you can copy straight into code, configuration, or test data.
Common use cases
- Seed database rows or API requests when you need a guaranteed-unique primary key.
- Generate correlation IDs for tracing requests through microservices.
- Create file names or upload tokens that will never collide across clients.
- Mock identifiers in unit tests, API mocks, or design prototypes.