UUID Generator (v4)
Generate RFC 4122 version 4 UUIDs in your browser (cryptographically strong randomness).
Choose options, then click Generate.
Tool description
UUID v4 values are 128-bit identifiers with randomly generated bits. They’re commonly used as IDs in databases, APIs, and distributed systems.
How to use
- Choose how many UUIDs you want and select formatting options.
- Click Generate and copy the list.
- Optionally validate an existing UUID string.
Why it’s useful
- Generate unique IDs without a server.
- Test APIs that expect UUID inputs.
- Quickly create sample datasets.
Use cases & interpretation
- Databases: primary keys that don’t leak sequential order.
- Events: idempotency keys and correlation IDs.
- Testing: generate fixtures quickly.
FAQs
They’re not mathematically guaranteed, but UUID v4 collisions are extraordinarily unlikely when generated with a cryptographically secure random source.
UUID version 4 sets specific bits to indicate “version” and “variant”. The rest are random.
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