UUID Generator

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

Count:

UPPERCASERemove dashes

Generated UUIDs

#1784ee802-171d-4c79-8bff-4cad03b6a313

#2561b324d-0f28-40d5-b0f3-4bc16a8fc399

#328dc0066-ce8f-401c-8f17-fa1652d497a6

#4eac5af00-bcbb-4b50-9516-411bedf84441

#5cd37661e-e37b-4741-9325-2bac76d17dbe

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