UUID Generator

Generate UUIDs for database keys, test fixtures and request IDs — random v4 or time-sortable v7, in the format you need.

0 × UUID v4

Inspect a UUID

v4 or v7?

UUID v4 is 122 random bits. It reveals nothing and is the default choice for most IDs.
UUID v7 (RFC 9562, 2024) starts with a 48-bit millisecond timestamp followed by random bits. New IDs sort after old ones, which keeps database B-tree indexes compact and inserts fast. It does reveal the creation time.

Will I ever get a duplicate?

With v4 you would need to generate about 2.7 quintillion UUIDs to have a 50% chance of a single collision. Randomness here comes from crypto.getRandomValues, the browser’s cryptographically secure generator.

Validate a UUID

Paste any UUID in the inspector to see its version and variant — and for v7 or v1, the timestamp inside it.

Questions

Is a UUID the same as a GUID?

Yes. GUID is Microsoft’s name for the same 128-bit format.

Are these UUIDs stored anywhere?

No. They’re generated in your browser and never sent to a server.