UUID Generator

Generate random UUID v4 identifiers instantly.

What is UUID Generator?

Generate UUID v4 online instantly with this free tool — no signup, no installation required. A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in software systems. Version 4 UUIDs are randomly generated, making collisions virtually impossible. They are perfect for database primary keys, session tokens, unique resource IDs in APIs, file names, and distributed system identifiers. Use the bulk generator to produce up to 100 UUIDs at once.

How to Use UUID Generator

  1. A single UUID v4 is generated automatically when the page loads.
  2. Click Generate to create a new random UUID, or use the bulk generator to produce up to 100 at once.
  3. Toggle uppercase/lowercase and with/without hyphens to match your requirements.
  4. Click any UUID to copy it to your clipboard instantly.

Frequently Asked Questions

UUID v4 is a randomly generated universally unique identifier. It contains 122 random bits, giving a total of 2^122 possible values — making accidental collisions practically impossible.

Use UUIDs as primary keys in databases, unique identifiers for API resources, session tokens, file names, and anywhere you need a globally unique string that doesn't expose sequential information.

While not mathematically guaranteed, the probability of two randomly generated UUIDs colliding is astronomically low — about 1 in 5.3 × 10^36. In practice, they are treated as unique.

v1 is time-based (may expose the machine's MAC address), v4 is fully random, and v7 (newer) combines a timestamp with randomness for sortability. v4 is the most widely used for general purposes.

Yes. Enter a count between 1 and 100 in the bulk generator and click Bulk Generate. All UUIDs are displayed in a scrollable list and can be copied to your clipboard with a single click.