ToolsForNerds

UUID/GUID Generator

Generate universally unique identifiers (UUID/GUID) in v1, v4, and v7 formats with multiple output styles

Generate 1-1000 UUIDs at once

Quick Reference

Version Recommendations:
UUID v4: Best for general use. Random, secure, no information leakage.
UUID v7: Best for databases. Timestamp-ordered, excellent for indexes.
UUID v1: Use only if you need MAC address. May expose system info.
Common Use Cases:
• Database IDs: v7 or v4
• API Request IDs: v4
• Session Tokens: v4
• Log Correlation: v7
• File Names: v4
• Distributed Systems: v7
Uniqueness Guarantee: UUID v4 has 2^122 possible values (5.3 × 10^36). You can generate 1 billion UUIDs per second for 100 years and have less than 50% chance of a single collision.

About the UUID/GUID Generator

Generate universally unique identifiers (UUIDs) and globally unique identifiers (GUIDs) in multiple formats. Essential for database keys, API development, distributed systems, and ensuring unique identifiers across your applications.

Features:

  • Generate UUID v1 (timestamp-based)
  • Generate UUID v4 (random)
  • Generate UUID v7 (timestamp-ordered, recommended)
  • Bulk generation (up to 1000 UUIDs)
  • Multiple output formats (standard, uppercase, no hyphens, braces)
  • Copy individual or all UUIDs to clipboard
  • Zero-conflict guarantee for v4 (cryptographically random)
  • Sortable by timestamp for v1 and v7

UUID Versions Explained:

  • UUID v1: Timestamp-based with MAC address. Sortable by creation time but may expose system information.
  • UUID v4: Randomly generated. Most common, excellent uniqueness, no information leakage. Industry standard for most use cases.
  • UUID v7: Timestamp-ordered with random data. Combines sortability of v1 with privacy of v4. Best for database indexes and distributed systems (recommended for new projects).

Output Formats:

  • Standard: 550e8400-e29b-41d4-a716-446655440000
  • Uppercase: 550E8400-E29B-41D4-A716-446655440000
  • No Hyphens: 550e8400e29b41d4a716446655440000
  • Braces: {550e8400-e29b-41d4-a716-446655440000}
  • URN: urn:uuid:550e8400-e29b-41d4-a716-446655440000

Use Cases:

  • Database primary keys and unique identifiers
  • API request/response tracking IDs
  • Distributed system correlation IDs
  • Session IDs and authentication tokens
  • File and document naming
  • Message queue identifiers
  • Microservices request tracing
  • Testing and mock data generation

Why Use UUIDs?

UUIDs provide a standardized way to generate unique identifiers without requiring central coordination. They're ideal for distributed systems, ensuring uniqueness across databases, servers, and applications. With 2^122 possible v4 UUIDs, collision probability is negligible even when generating billions of identifiers.