How to Generate UUIDs Online — v4 IDs for Apps and Databases

A UUID is a universally unique identifier. Developers use UUIDs for database records, test data, distributed systems, file names, session references and object IDs. They are useful when you need unique values without asking a central server for the next number.

Utilao's UUID Generator creates UUIDs online for quick development and testing workflows.

What is UUID v4?

UUID v4 is randomly generated. It does not depend on a timestamp, MAC address or database sequence. The chance of generating the same UUID twice is extremely small, which makes UUID v4 a practical choice for many apps.

UUIDs are longer than sequential IDs, but they work well when records can be created across different systems.

When should you use UUIDs?

Use UUIDs when you need unique identifiers across services, devices, imports, test fixtures or distributed databases. They are common in APIs because they do not reveal how many records exist and are harder to guess than simple sequential IDs.

Sequential IDs are still useful for small internal systems. UUIDs are useful when uniqueness and portability matter more than short IDs.

How to generate UUIDs online

1. Open the UUID Generator.
2. Choose the UUID version if the tool provides options.
3. Generate one or multiple UUIDs.
4. Copy them into your app, test data or database script.

FAQ

Are UUIDs guaranteed to be unique?

UUIDs are designed so collisions are extremely unlikely. In practice, UUID v4 is considered safe for normal application use.

Can I use UUIDs as database primary keys?

Yes. Many systems use UUIDs as primary keys, especially distributed applications.

Are UUIDs secret?

No. UUIDs are identifiers, not secrets. Do not use them as passwords or API keys.