UUID / ULID generator
Generate UUID v4, UUID v1, and ULID values in the browser for databases, events, URLs, and application IDs.
Quantity:
Current: UUID-V4Count: 0
What is a UUID?
A UUID is a 128-bit identifier that is usually rendered as 32 hexadecimal characters separated by hyphens.
UUID v4 (recommended): Randomly generated. Collisions are so unlikely that UUID v4 works well for most application IDs, session tokens, and database keys.
UUID v1: Generated from timestamps and hardware-related information. It preserves ordering better, but it can reveal timing and machine details.
What is a ULID?
A ULID is a lexicographically sortable alternative to UUIDs that keeps the same 128-bit size while producing IDs that are easier to sort by time.
Sortable: ULIDs sort naturally by generation time, which can help with indexing and logs.
URL safe: ULIDs use Crockford Base32 and avoid confusing characters such as I, L, O, and U.
Interoperable: They remain compact and unique enough for many of the same workloads where UUIDs are used.
Frequently asked questions
Can UUID v4 ever collide?
Theoretically yes, but the probability is so small that it is negligible for practical application workloads.
Should I use UUID or ULID?
Use ULID when time ordering matters. Use UUID v4 when you want the most familiar and widely supported random identifier format.
Is this generator safe?
Yes. The IDs are generated locally in the browser and are not sent to a server.