UUID Generator
Generate cryptographically random UUID version 4 identifiers. Bulk mode for seeding databases and test fixtures.
Frequently asked questions
What is a UUID v4?
A 128-bit identifier with 122 bits drawn from a cryptographic random source. The '4' marks the version; collisions are so unlikely that random UUIDs are routinely used as database keys without checking for duplicates.
Are these UUIDs really random and private?
Yes. They are generated with crypto.randomUUID(), backed by your operating system's secure random source — and generated locally, so no server ever sees them.
UUID vs GUID vs ULID — what should I use?
UUID and GUID are the same thing in practice. ULIDs add time-ordering and shorter representation, better for sortable keys. For general-purpose unique IDs, UUID v4 remains the safe default.