About this Tool
A Universally Unique Identifier (UUID), also known as a GUID, is a 128-bit label used for information in computer systems. Version 4 UUIDs are generated using cryptographic random numbers, meaning the probability of a collision (generating the same UUID twice) is practically zero. Click the button to instantly generate a valid RFC 4122 UUID v4.
Frequently Asked Questions
What is the probability of a UUID collision?
A UUID v4 has 122 random bits. You would need to generate 1 billion UUIDs per second for about 85 years to have a 50% chance of a single collision.