Are UUIDs guaranteed unique?

Collisions are astronomically unlikely for v4. Do not rely on them for security secrets.

Uuid

uuid • generate

Count

9a18b20f-5a31-432b-adca-e987d2bbbab7
68536e16-797c-4cca-9728-06831fbb6343
d5c356a1-a232-4989-90b2-1290d9ce41e6
58a9c033-6b1d-45af-9d46-ddd4d7b61526
bfc2505a-ea0d-41c6-a0e5-e2005bee7805

About this tool

Generate random UUID v4 identifiers for database keys, correlation IDs, and distributed systems. Each value is statistically unique for practical purposes.

Your input is processed in the browser. We do not upload tool payloads to our servers.

Common use cases

Create primary keys for prototypes.
Generate request IDs for logging.
Populate test fixtures with unique identifiers.

Examples

UUID v4 format

Eight-four-four-four-twelve hex groups, for example 550e8400-e29b-41d4-a716-446655440000.

FAQ

Are UUIDs guaranteed unique?: Collisions are astronomically unlikely for v4. Do not rely on them for security secrets.

About this tool

Common use cases

Examples

UUID v4 format

FAQ

Related tools