About the UUID Generator
A UUID (universally unique identifier) is a 128-bit value used as an ID that's practically guaranteed not to collide — even across different systems generating them independently. They look like 550e8400-e29b-41d4-a716-446655440000.
This generator creates version-4 UUIDs (random) in your browser. Because v4 UUIDs are random, you can generate them offline and trust they won't clash, which is why they're the default for database keys, request IDs and more.
How to use the UUID Generator
- 1Open the tool — a fresh UUID is generated instantly.
- 2Generate more, or a batch, as needed.
- 3Copy the UUID(s) for use as IDs.
Common uses
Database primary keys
Use UUIDs instead of auto-increment IDs to avoid coordination across services.
Request / correlation IDs
Tag logs and traces so a request can be followed across systems.
Idempotency keys
Give each operation a unique key to safely retry it.
Frequently asked questions
Will two UUIDs ever collide?
Practically never. A v4 UUID has 122 random bits; you'd need to generate billions per second for many years before a collision became likely.
What's the difference between v1 and v4?
v1 is based on timestamp + MAC address (ordered but leaks info); v4 is fully random. v4 is the safe default for most uses.
Are the UUIDs generated privately?
Yes. They're created in your browser using its cryptographic random source — nothing is sent anywhere.
Can I use a UUID as a database key?
Yes, and it's common. Note random UUIDs can fragment some indexes; UUIDv7 or ULIDs are alternatives when insert order matters.