What is the difference between UUID versions?

UUID v4 (used by this tool) is randomly generated and is the most commonly used version. UUID v1 is based on timestamp and MAC address. UUID v3 and v5 are based on namespace and name hashing. V4 is preferred for most applications due to its simplicity and strong randomness.

Are UUIDs truly unique?

While theoretically possible to generate duplicate UUIDs, the probability is astronomically low. With proper random number generation, the chance of collision is so small that it's considered negligible for practical purposes. You would need to generate billions of UUIDs per second for many years to have a reasonable chance of collision.

Can I use these UUIDs in production?

Yes, the UUIDs generated by this tool use cryptographically strong random number generation and are suitable for production use. They follow the RFC 4122 standard for UUID v4.

What format are the UUIDs in?

The UUIDs are generated in the standard format: 8-4-4-4-12 hexadecimal digits separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). This is the most widely recognized and compatible format.

UUID Generator (v4)

Generate unique UUIDs (v4) instantly for databases, APIs, and distributed systems.

Number of UUIDs

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by the Open Software Foundation (OSF) and are also known as GUIDs (Globally Unique Identifiers). Version 4 UUIDs are randomly generated and have an extremely low probability of collision, making them ideal for distributed systems where coordination between systems is impractical.

How to Use the UUID Generator

Click the "Generate UUID" button to create a new random UUID v4. You can generate multiple UUIDs at once by clicking the button multiple times. Each UUID is displayed in the standard format (8-4-4-4-12 hexadecimal digits). Click the copy button next to any UUID to copy it to your clipboard. The tool generates cryptographically strong random UUIDs suitable for production use.

Common Use Cases for UUIDs

UUIDs are commonly used as primary keys in databases, unique identifiers for API resources, session identifiers, file names for uploaded content, tracking identifiers in distributed systems, and message IDs in messaging systems. They're particularly useful in distributed systems where multiple nodes need to generate unique identifiers without coordination.

UUID Generator (v4)

What is a UUID?

How to Use the UUID Generator

Common Use Cases for UUIDs

Frequently Asked Questions