UUID Generator
Generate UUID v4.
About the UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value used as an opaque ID for database rows, request correlation, file names, and distributed systems. Generators create IDs that are extremely unlikely to collide without a central counter.
How to use
- Generate one or more UUIDs.
- Copy the value into your app, fixture, or document.
- Keep the format your system expects (with/without hyphens, uppercase/lowercase).
Tips
- Prefer UUIDs as opaque IDs — do not encode meaning into them.
- For sort-friendly IDs, some systems use ULID/UUIDv7 style time-ordered identifiers instead.
- UUIDs are identifiers, not authentication secrets by themselves.
FAQ
Can two generators create the same UUID? With standard versions and healthy randomness, collisions are negligible for normal application use.