UUID Generator

UUIDs (Universally Unique Identifiers) are 128-bit values used as unique IDs in databases, APIs, and distributed systems. A UUID v4 is generated from random data, so the chance of collision is astronomically low. Format: 8-4-4-4-12 hex characters, e.g. 550e8400-e29b-41d4-a716-446655440000. This UUID Generator creates a new v4 UUID on each click. Uses cryptographically secure randomness from your browser. No server calls, no storage. Click, copy, use.

Use UUIDs when you need globally unique identifiers without coordination. Databases use them as primary keys when merging data from multiple sources. APIs return UUIDs for resources. Distributed systems use them to avoid ID collisions across nodes. One UUID per entity—no central authority needed. Paste into your schema, your API response, or your test data. The format is standard; tools and languages recognize it everywhere.

This tool generates one UUID per click. For bulk generation, click multiple times or use a script. Each UUID is independent; there's no sequence or relationship between them. Store them in your database, send them in APIs, or use them in tests. They're not sortable by creation time—if you need that, consider ULIDs or add a timestamp column. For most "I need a unique ID" cases, UUID v4 is the answer.

All generation is local. Your browser's crypto API produces the randomness. We don't see, store, or log your UUIDs. Fast, private, and simple. Bookmark it for the next time you need an ID—for a new record, a test fixture, or a placeholder.