Generate RFC 4122 compliant v4 UUIDs with customizable formatting and bulk generation options.
Click "Generate UUIDs" to create new UUIDs.
Learn about Universally Unique Identifiers
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Also known as GUID (Globally Unique Identifier).
Version 4 UUIDs are randomly generated. The format is 8-4-4-4-12 hexadecimal digits, with specific version and variant bits set to identify the UUID type.
UUIDs are used for database primary keys, session identifiers, file names, distributed systems, API keys, and anywhere unique identifiers are needed.
The probability of generating duplicate UUIDs is extremely low - approximately 1 in 5.3 x 10³⁶, making collisions virtually impossible.
Our generator follows the RFC 4122 specification, ensuring compatibility with all systems that support standard UUIDs.
All UUID generation happens locally in your browser using cryptographically secure random number generation. Nothing is sent to any server.