Generate cryptographically random UUID v4 identifiers instantly. Bulk generate up to 100 at once in multiple formats.
ExperToolBox's UUID generator creates cryptographically random Version 4 UUIDs (Universally Unique Identifiers) instantly. Generate a single UUID or bulk-generate up to 100 at once, in multiple formats: standard hyphenated, uppercase, no-hyphen, braces-wrapped or quoted. All UUIDs are generated using your browser's crypto.getRandomValues() — the same cryptographic standard used in security software.
A UUID v4 looks like this: 550e8400-e29b-41d4-a716-446655440000. It consists of 32 hexadecimal digits displayed in five groups separated by hyphens. The "4" in the third group identifies it as version 4 (random).
UUIDs are used as primary keys in distributed databases where auto-increment integers would cause conflicts between different servers. They identify sessions, transactions, uploaded files, API resources and any entity that needs a globally unique identifier. In software development, UUIDs are fundamental to microservices architecture where multiple services need to create records independently without coordination.
UUID v1 uses the device's MAC address and current timestamp — traceable back to when and where it was created. UUID v3 and v5 are deterministic — the same name always produces the same UUID. UUID v4 is completely random — the recommended choice for most use cases as it reveals no information about the generating system.