UUID Generator � Create Unique Identifiers Instantly

The UUID Generator creates universally unique identifiers in multiple versions. UUIDs are 128-bit numbers used to identify information in computer systems. The number of possible UUIDs is 2^128 or approximately 3.4 x 10^38 � enough to assign a unique UUID to every atom on Earth.

UUID Versions Explained

UUID v1 (Time-Based)

Generated using the current timestamp and MAC address. Best when you need sortable, time-ordered identifiers that reveal when they were created.

UUID v4 (Random)

The most commonly used version. Generated using cryptographically random numbers. Ideal for database primary keys in distributed systems, session IDs, and general-purpose unique identification.

UUID v3 and v5 (Name-Based)

Generated deterministically from a namespace UUID and a name using MD5 (v3) or SHA-1 (v5). The same namespace and name always produce the same UUID � perfect for content-addressable systems.

Common Use Cases

• Database Primary Keys: Use UUIDs instead of auto-incrementing integers in distributed databases
• Session IDs: Generate unique session identifiers for web applications
• File Identifiers: Create unique filenames in cloud storage systems
• API Request Tracking: Assign unique IDs to track requests across microservices

Related Tools

• Token Generator � Generate custom random strings with configurable character sets
• ULID Generator � Generate sortable unique identifiers with timestamp prefix
• Random Port Generator � Generate random network port numbers