Utilizist
Generators

UUID Generator

Generate unique identifiers (UUIDs)

Inputs

Other Tools in This Category

Password Generator
Generators
Create secure and random passwords
QR Code Generator
Generators
Create high-quality QR codes for any text or URL instantly
Random Number Generator
Generators
Generate random numbers within a range

Most Popular Tools

Currency Converter
Finance
Convert currencies instantly with live exchange rates
VAT Calculator
Finance
Calculate prices with and without VAT
Gross → Net Salary
Finance
Calculate net salary from gross

UUID Generator

Generate UUIDs (Universally Unique Identifiers) for your projects. Support for V1 (time-based) and V4 (random) versions.

Key Terms

  • UUID: 128-bit unique identifier standard
  • V4 (Random): UUID generated from random numbers
  • V1 (Time-based): UUID using timestamp and system info
  • Hexadecimal: Base-16 number system (0-9, a-f)
  • GUID: Microsoft's term for UUID (same thing)

What Are These Terms?

UUID (Universally Unique Identifier)

A 128-bit number represented as 36 characters (32 hex digits + 4 hyphens). Format: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx. Used for unique identification in databases, APIs, and distributed systems.

V4 (Random)

Most common UUID version. Uses random numbers to generate IDs. Format guarantees uniqueness through statistical probability (collision chance: 1 in 5.3×10³⁶). Perfect for most applications.

V1 (Time-based)

Uses current timestamp plus system-specific information. Includes creation time in the ID itself, allowing chronological sorting. Less random than V4 but contains temporal information.

Hexadecimal

Base-16 numbering using 0-9 and a-f. Each UUID character can be one of 16 values, providing massive combination space (2¹²⁸ possible UUIDs).

How Does The Tool Work?

Generation Methods

V4 (Random):

  • Generates 122 random bits
  • Sets version bits to '4'
  • Sets variant bits to RFC4122 standard
  • Formats as 8-4-4-4-12 hex pattern

V1 (Time-based):

  • Uses current timestamp
  • Adds random component
  • Sets version bits to '1'
  • Formats same as V4

Real-World Examples

Example 1: Database Primary Keys

  • Count: 5, Version: V4
  • Result:
    • 550e8400-e29b-41d4-a716-446655440000
    • f47ac10b-58cc-4372-a567-0e02b2c3d479
    • 6ba7b810-9dad-11d1-80b4-00c04fd430c8
    • 123e4567-e89b-12d3-a456-426614174000
    • c73bcdcc-2669-4bf6-81d3-e4ae73fb11fd

Example 2: API Request IDs

  • Count: 1, Version: V4
  • Result: 902f0e3a-8c48-4d1f-a8c4-7c5b9d3f2e1a
  • Use for tracking single API request

Example 3: File Naming

  • Count: 3, Version: V1
  • Result: Time-ordered IDs for chronological file tracking

Common Use Cases

  • Database primary keys
  • API request/response tracking
  • File naming (unique, sortable)
  • Session identifiers
  • Distributed system coordination
  • Microservices correlation IDs
  • Cloud resource identifiers