UUID Generator
Generate secure UUID v4 identifiers for APIs, databases and test data.
UUID Generator Options
UUID Details
UUID Version
v4
Generated
10
Format
Canonical
Free UUID v4 Generator for APIs and Databases
Generate random UUID v4 identifiers for database records, API resources, distributed systems, fixtures and development testing.
What is a UUID?
A UUID is a universally unique identifier commonly used to label records, resources and events. Version 4 UUIDs are generated from random data and are useful when identifiers need to be created without a central sequence.
UUIDs are popular in distributed systems, public API IDs, imports, fixtures and systems where auto-increment values are not ideal.
Key Features
UUID v4 Output
Generate random version 4 UUID values.
Batch Generation
Create multiple identifiers at once for testing or imports.
Format Options
Use canonical hyphenated output or compact strings.
Uppercase Option
Generate uppercase identifiers when a system expects that format.
Common Use Cases
How to Use This Tool
- 1 Choose how many UUIDs you need.
- 2 Select canonical, compact or uppercase options.
- 3 Generate the UUIDs.
- 4 Copy the identifiers into your database, code or test fixture.
Frequently Asked Questions
Are UUIDs guaranteed unique?
UUID v4 values are random with an extremely low collision probability, but no random system is mathematically impossible to collide.
When should I use UUIDs?
Use them when distributed generation, public IDs or hard-to-guess identifiers are useful.
Are UUIDs good primary keys?
They can be, but review database indexing and storage tradeoffs for high-volume tables.