UUID Generator
UUID v4 Generator – Create Unique Identifiers Instantly
Generate universally unique identifiers with one click. UUID v4 (Universally Unique Identifier version 4) is a 36-character alphanumeric code including letters, numbers and hyphens, as specified by RFC 4122. Generate multiple UUIDs at once for batch testing, database seeding and distributed systems.What is UUID v4?
UUID v4 is a universally unique identifier using random numbers to ensure each code is exclusive. Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (the '4' indicates version 4).Common UUID Use Cases
UUIDs ensure uniqueness in data identification: software development for unique records and objects; databases as distributed primary keys; distributed systems for synchronization; REST APIs for resource identification; microservices for transaction monitoring; IoT devices for hardware identification; web sessions for user authentication.How to Use
Click 'Generate UUID' to create a unique UUID v4 code instantly. For bulk generation, enable 'Generate Multiple UUIDs' and select quantity (2-100). Copy individual UUIDs or all at once with one click.Frequently Asked Questions
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier standard defined by RFC 4122. Version 4 uses random numbers to generate unique codes, making collisions virtually impossible.
Are UUID v4 truly unique?
Yes. With 122 random bits, there are 5.3 undecillion possible combinations. The probability of generating two identical UUIDs is astronomically low, making them safe for distributed systems.
What's the difference between UUID versions?
UUID v1 uses timestamp and MAC address; v4 uses random numbers (most common); v5 uses namespace and SHA-1 hash. Version 4 is preferred for its simplicity and privacy (no hardware info exposed).
Can I use UUIDs as database primary keys?
Yes. UUIDs are ideal for distributed databases where auto-increment IDs would conflict. They allow generating IDs client-side without database coordination.
Is this generator free?
Yes, completely free with no limits. Generate as many UUIDs as needed without registration or payment.