Free UUID Generator Online — v4 UUIDs in Bulk
A UUID (Universally Unique Identifier, also called a GUID) is a 128-bit value used as an ID that's practically guaranteed never to collide with another — so systems can generate IDs independently without coordinating. Version 4 is randomly generated, which is why it's the everyday choice for database keys, request IDs, and file names. Generate one or many here and copy instantly.
Frequently Asked Questions
- What is UUID v4?
- UUID v4 (Universally Unique Identifier version 4) is a randomly generated 128-bit identifier in the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
- Are the UUIDs truly unique?
- UUID v4 uses cryptographic randomness. The probability of two UUIDs colliding is vanishingly small — effectively unique for all practical purposes.