Generate random UUIDs (v4) instantly. Create single or bulk UUIDs for your projects with one click.
f63d5161-a16f-4f4a-9ff6-74aa8d45d9d8A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify records, sessions, transactions, and objects in distributed systems without needing a central authority or coordination between parties. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens: 550e8400-e29b-41d4-a716-446655440000.
v1 Based on timestamp + MAC address. Sortable by time but reveals hardware info. v4 Completely random. Most popular version, used in 90%+ of cases. v5 Deterministic, generated from a namespace + name using SHA-1. Same input always produces the same UUID. v7 The newest version (2022), combining a Unix timestamp prefix with random bits for both uniqueness and sortability.
Choose version
Select UUID v4 (random) for most use cases, or v1/v5 for specific needs.
Generate
Click to generate one or multiple UUIDs instantly.
Copy & use
Copy individual UUIDs or bulk-generate hundreds for database seeding.
Backend developers
Generate primary keys for database records without auto-increment conflicts.
Distributed systems
Create unique identifiers across microservices without coordination.
Session management
Generate unpredictable session tokens and correlation IDs.
Testing & QA
Seed test databases with unique IDs for integration testing.
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are designed to be unique across space and time without requiring a central authority.
UUID v1 is generated using a timestamp and MAC address, so it can reveal when and where it was created. UUID v4 is randomly generated, making it completely anonymous and the most commonly used version.
While not mathematically guaranteed to be unique, the probability of generating a duplicate UUID v4 is astronomically low - about 1 in 5.3×10^36. For all practical purposes, they are unique.