Online UUID / GUID Generator
Generate UUIDs (Universally Unique Identifiers) that conform to RFC 4122.
Frequently Asked Questions
What is a UUID?
UUID (or GUID) stands for Universally Unique Identifier (or Globally Unique Identifier). It is a 128-bit value used to uniquely identify information in computer systems. GUIDs are commonly used in Microsoft ecosystems, while UUID is the standard term everywhere else.
How unique are UUIDs?
With 128 bits of entropy, generating 1 billion UUIDs per second for an entire year would only produce a 50% chance of a single collision. This makes UUID collisions virtually impossible in practice.
What are common uses for UUIDs?
UUIDs are used as database primary keys, session tokens, distributed system identifiers, API request tracing, and anywhere a truly unique value is needed without central coordination.
What is the format of a UUID?
A UUID is a 128-bit number displayed as 32 hexadecimal digits in five groups separated by hyphens: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx. The M digit indicates the UUID version (e.g., 4 for random), and the N digit indicates the variant.
The UUIDs generated by this site are provided as-is without warranty of any kind. You are responsible for how you use them. Do not rely on UUIDs from cached pages.