Generate random UUID v4 identifiers. Click to copy.
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. Also known as GUID (Globally Unique Identifier). The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is a hex digit and y is 8, 9, a, or b.
UUIDs are used as database primary keys, API request identifiers, session tokens, file names, distributed system identifiers, and anywhere you need a unique ID without coordination between systems.
This tool generates Version 4 UUIDs, which are randomly generated. With 122 random bits, the probability of generating a duplicate is astronomically small — you'd need to generate 2.71 quintillion UUIDs to have a 50% chance of a collision.