🔷 UUID Generator

A UUID is a 128-bit identifier standardized under RFC 4122 and RFC 9562. With 2^128 possible values, the chance of collision is mathematically negligible. These identifiers are unique across space and time without a central authority, making them essential for distributed systems.

UUID v4 is entirely random, offering strong uniqueness but poor database locality because inserts scatter across index pages. UUID v7 encodes a Unix timestamp so records sort roughly by creation time. This reduces page splits in B-tree indexes and improves write performance significantly.

Use UUIDs as primary keys when merging databases or replicating across regions. They serve as opaque API identifiers preventing enumeration attacks. In distributed systems, they identify events in event sourcing without needing a central sequence server.

Our generator runs entirely in your browser using the Web Crypto API. Generate 1 to 100 UUIDs instantly. Nothing is uploaded to any server, so your identifiers remain private and never leave your device.

Use UUID v7 for database primary keys to maintain index-friendly ordering. Reserve UUID v4 for session tokens and security salts where time-ordering is irrelevant. Avoid auto-increment integers in public APIs as they expose row counts.

UUIDs are not guaranteed unique - they are probabilistically unique with collision odds so low they're practically zero. GUID is Microsoft's brand name for the same standard. At 16 bytes the storage overhead is negligible versus the flexibility gained.