UUID Generator
Generate random UUIDs (v4, v7) instantly.
How to Use
Click the generate button to create a new UUID instantly. Choose between UUID v4 (random) and UUID v7 (time-ordered random). You can generate multiple UUIDs at once and copy them individually or as a batch. Options include uppercase and without-hyphens formatting.
Common Use Cases
- Generating unique primary keys for database records in distributed systems
- Creating correlation IDs for tracing requests across microservices
- Producing unique identifiers for file uploads or session tokens
- Generating test data with realistic unique IDs for integration tests
Frequently Asked Questions
What is the difference between UUID v4 and UUID v7?
UUID v4 is fully random, while UUID v7 embeds a Unix timestamp in the first 48 bits, making them roughly sortable by creation time. UUID v7 is ideal for database primary keys where insertion order matters.
Is a UUID truly unique?
UUID v4 uses 122 random bits, giving roughly 5.3 x 10^36 possible values. The probability of a collision is astronomically small and safe to treat as unique for all practical purposes.
Can I use UUIDs as database primary keys?
Yes. UUIDs are widely used as primary keys, especially in distributed databases. UUID v7 is recommended over v4 for indexed columns because its time-ordered nature reduces B-tree fragmentation.