UUID Generator
Generate random UUID v4 identifiers for your applications.
Click Generate to create UUIDs
What is UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across both space and time. Version 4 UUIDs are randomly generated and are commonly used as primary keys in databases, session identifiers, correlation IDs in distributed systems, and anywhere you need a unique identifier without coordinating with a central authority.
How to Use This Tool
- Set the quantity of UUIDs you need (1 to 100)
- Choose between lowercase or UPPERCASE format
- Click 'Generate UUIDs' to create new identifiers
- Copy individual UUIDs or all at once
Common Use Cases
- Database primary keys and record identifiers
- Session tokens and authentication identifiers
- File naming for unique, collision-free names
- Distributed system correlation IDs for tracing
Frequently Asked Questions
What is UUID v4?
UUID v4 is a version of UUID that is generated using random numbers. It has the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the '4' indicates version 4, and 'y' is one of 8, 9, A, or B.
Are UUID v4 values truly unique?
While not mathematically impossible to have collisions, the probability is astronomically low. With 122 random bits, you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a collision.
Can I use UUIDs as database primary keys?
Yes, UUIDs are commonly used as primary keys. They allow distributed systems to generate IDs independently. However, they use more storage than integers and can impact index performance in some databases.