UUID Generator
Generate random UUID v4 identifiers. Create single or bulk UUIDs with formatting options.
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Click "Generate UUIDs" to create new identifiers
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About UUID v4
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across both space and time. Version 4 UUIDs are randomly generated, providing approximately 5.3 × 1036 possible values, making collisions virtually impossible.
UUID v4 Format
A UUID v4 follows the pattern xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is any hexadecimal digit and y is one of 8, 9, a, or b. The 4 indicates the UUID version, and the leading bits of the y position indicate the variant.
Common Use Cases
- Database primary keys and record identifiers
- Session tokens and correlation IDs
- Distributed system identifiers
- File naming to avoid conflicts
UUIDs are generated entirely in your browser using the Web Crypto API for secure randomness. No data is sent to any server.