UUID Generator
Generate UUID v4 identifiers. Single or bulk generation, validate UUIDs, copy with one click. All processing happens in your browser.
Click Generate to create a UUIDPaste a string to check if it is a valid UUID v4
UUID (Universally Unique Identifier) v4 uses random numbers and provides 122 bits of randomness. Ideal for unique IDs, correlation IDs, and non-guessable tokens.
Need API Development?What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier represented as 32 hexadecimal characters, often with hyphens: 8-4-4-4-12. UUID v4 uses random numbers, providing 122 bits of randomness and making collisions astronomically unlikely in practice.
Common Use Cases
UUIDs are used for primary keys in databases, correlation IDs in distributed systems, session tokens, file identifiers, and non-guessable URLs. They can be generated offline without coordination, unlike sequential IDs.
UUID v4 Format
The version digit (4) and variant bits are fixed. The rest is random. Hyphens are optional; both 550e8400-e29b-41d4-a716-446655440000 and550e8400e29b41d4a716446655440000 are valid representations.