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UUID Generator
Generate UUID v4 (random) or UUID v7 (time-sorted) identifiers. Bulk generate, format, and copy.
5 UUIDs generated
cafd3f4c-5271-40f0-bb89-2869858a05f9Click to copyf0c990ea-ed8c-469a-bc15-130276321496Click to copy74eafcf5-39c3-4661-9a1f-45834c34e0eaClick to copy8aafabb0-a989-44af-a334-aa5b06be3186Click to copy68c97480-77dd-4e4b-9c2e-00c607468f5fClick to copyWhat is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUIDs are used as primary keys in databases, API identifiers, session tokens, and anywhere you need a globally unique ID without coordinating with a central authority.
UUID v4 vs UUID v7
| Feature | UUID v4 | UUID v7 |
|---|---|---|
| Generation | Random | Time-sorted + random |
| Sortable | No | Yes (by creation time) |
| Database Index | Poor (random inserts) | Excellent (sequential) |
| Privacy | No timestamp leaked | Contains creation timestamp |
| Standard | RFC 4122 | RFC 9562 (2024) |
| Use Case | General purpose | Database primary keys |
When to Use UUIDs
- Database primary keys: Use UUID v7 for better index performance
- API resource IDs: Use UUID v4 for unpredictability
- Distributed systems: Generate IDs without central coordination
- File names: Avoid collisions in file uploads and storage
- Correlation IDs: Track requests across microservices
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