UUID Generator

Generate random UUID version 4 identifiers for unique identification in databases, APIs, and distributed systems. Fast and secure UUID creation.

UUID Generator FAQ

What is a UUID?

UUID stands for Universally Unique Identifier. It's a 128-bit number used to uniquely identify information in computer systems. UUIDs are designed to be unique across all systems without requiring a central authority.

What is UUID v4?

UUID version 4 is a randomly generated UUID. It uses cryptographically strong random numbers to create identifiers with an extremely low probability of collision. The format is: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is hexadecimal and y is 8, 9, A, or B.

How unique are UUIDs?

UUIDs are extremely unique. The probability of generating duplicate UUID v4 identifiers is so low it's effectively zero. You would need to generate billions of UUIDs per second for many years to have even a tiny chance of collision.

Where are UUIDs commonly used?

UUIDs are used as primary keys in databases, session identifiers in web applications, unique filenames, distributed system identifiers, transaction IDs in APIs, and anywhere a globally unique identifier is needed without central coordination.

Are the generated UUIDs secure?

Yes, this tool uses the browser's crypto.randomUUID() method which generates cryptographically strong random UUIDs. These are suitable for security-sensitive applications including authentication tokens and secure identifiers.

Can I generate multiple UUIDs at once?

Yes, you can generate individual UUIDs or click "Generate 10 UUIDs" to create multiple unique identifiers at once. Each UUID includes a copy button for easy use in your projects.