Developer
UUID and ULID generator
Generate RFC 4122 UUID version 4 values and ULIDs in your browser. Create one or a batch and copy them.
Generate identifiers to see them here.
How to use
Choose UUID or ULID, set how many to create, and generate. UUIDs can be lowercased. Nothing is reserved on a server.
Questions
- What is the difference?
- UUID v4 is random. A ULID encodes a millisecond timestamp in the first characters, so values sort roughly by creation time.
- Are these unique enough?
- For ordinary app IDs, yes. They use the Web Crypto API. They are not a substitute for a database unique constraint if you need one.