UUID Generator
Generates version 4 UUIDs — 128-bit identifiers that are randomly generated rather than derived from time or hardware. The format is 36 characters: 32 hexadecimal digits in five hyphen-separated groups.
Free, no signupRuns entirely in your browser
Input
Result
7a1e57e4-6125-4cff-8a3d-83abbfffabda 51a99bad-ebed-4cf2-88b5-e37d3a2e7c3b c0de267c-0ebc-47bf-8139-2ee0d8abf385 c5b8a4b4-affe-4fa7-8315-e94bda369c72 1277a6fb-1689-4d88-801a-1680d858ab40
About
What the UUID Generator does
The point of a UUID is that you can generate one anywhere without coordination and be confident it is unique. With 122 random bits, you would need to generate billions of UUIDs per second for a century before a collision became likely — which is why distributed systems use them instead of a central counter.
How it works
Using the UUID Generator
- 1Choose how many UUIDs you need.
- 2Each is generated with random values in the appropriate positions.
- 3The version digit is set to 4, marking it as randomly generated.
- 4The variant bits are set as the specification requires.
- 5Copy the resulting identifiers.
Use cases
What people use it for
- Creating primary keys without a central sequence
- Generating correlation IDs for tracing requests
- Producing idempotency keys for API calls
- Naming files or records uniquely across systems
FAQ
Frequently asked questions
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