UUID Generator

Generate cryptographically secure v4 UUIDs / GUIDs. Single or bulk.

100% in your browser · No uploads
Output
What this does
UUID Generator produces v4 UUIDs (also called GUIDs) — universally unique identifiers used in databases, APIs, and software development. Generate one at a time or in bulk.
When to use it
  • Creating primary keys for a database table
  • Generating tracking IDs for events or transactions
  • Producing test data with realistic-looking unique identifiers
  • Replacing predictable IDs with cryptographically random ones
Frequently asked
How unique is a v4 UUID?
Astronomically unique. There are 2^122 possible v4 UUIDs (~5.3 × 10^36). You could generate a billion per second for a billion years and still have a near-zero chance of collision.
What's the difference between UUID v1, v4, and v7?
v1 includes the MAC address and timestamp (less private). v4 is fully random (most common). v7 is timestamp-ordered (good for database indexes). Uvelia generates v4.