UUID Generator

Generate UUIDs (Universally Unique Identifiers) with custom formatting options. Bulk generation, copy, and more.

Count:

UPPERCASERemove dashes

Generated UUIDs

#19f885814-37eb-4bd7-af12-e43f76022b74

#2547361dd-dfaa-4014-9643-283fadf3e26a

#3b3344473-5377-4b55-a863-81f783bdde7c

#4f9842036-c2d1-4001-a695-5eb6662882dd

#50d8e3c79-a2a1-4753-8b19-e8d16210c30d

Version

UUID v4

Format

8-4-4-4-12 (lowercase)

Total generated

What is a UUID? ▾

UUID stands for Universally Unique Identifier. It is a 128-bit label used for unique identification in computer systems. RFC 4122 defines the standard format.

A UUID is represented as 32 hexadecimal digits displayed in 5 groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. This totals 36 characters (32 hex digits + 4 hyphens).

UUID Versions

v1 — Time-based, derived from timestamp and MAC address

v4 — Random, generated from random or pseudo-random numbers (this tool)

v7 — Time-ordered, combines timestamp with random data for better DB index performance

Key Properties

Uniqueness — The probability of collision is extremely low (about 1 in 5.3 × 10³⁶ for v4)
No central authority — Anyone can generate a UUID without registration
Standardized — RFC 4122 ensures interoperability across systems