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UUID Generator

Generate RFC-compliant UUIDs instantly for databases, APIs, and distributed systems.

UUID Generator Tool

Generate RFC-compliant UUIDs instantly for databases, APIs, and distributed systems. Supports UUID versions v1 (time-based), v4 (random), and v7 (time-ordered). All generation happens client-side for maximum privacy.

UUID Configuration

Random UUID (cryptographically secure)
Time-based UUID (timestamp + MAC address)
Time-ordered UUID (modern, sortable)

Generate 1 to 100 UUIDs at once

Generated UUIDs

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What Is a UUID and When Should You Use It?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by RFC 4122 and are designed to be globally unique, making them ideal for distributed systems.

UUID Version Differences:

  • UUID v1 (Time-based): Generated using timestamp and MAC address. Predictable but contains creation time information.
  • UUID v4 (Random): Generated using random or pseudo-random numbers. Most common, offers highest uniqueness probability.
  • UUID v7 (Time-ordered): Modern UUID with timestamp in most significant bits. Sortable by creation time, ideal for database indexing.

When to Use UUIDs Instead of Auto-increment IDs:

  • Distributed systems with multiple databases
  • Microservices architecture
  • Client-side ID generation
  • Offline-capable applications
  • When you need to merge datasets from different sources
  • Security-sensitive applications (prevents ID enumeration)

Common Use Cases

Database Primary Keys

Use UUIDs as primary keys in PostgreSQL, MySQL, MongoDB, etc. for distributed database scenarios.

REST API Identifiers

Generate unique resource IDs for REST APIs to prevent ID collisions across services.

Microservices Communication

Use UUIDs as correlation IDs to trace requests across multiple microservices.

Event IDs and Logs

Generate unique IDs for system events, logs, and audit trails for traceability.

Frequently Asked Questions

Is this UUID generator RFC compliant?

Yes, our UUID generator produces RFC 4122 compliant UUIDs for all versions (v1, v4, v7). The generated UUIDs follow the standard format and can be used in any system that requires standard UUIDs.

Are generated UUIDs stored anywhere?

No, all UUID generation happens client-side in your browser. We don't send your data to any server, and no UUIDs are stored or logged. This ensures complete privacy and security.

What UUID version should I use?

Use UUID v4 for most cases (random, high uniqueness). Use UUID v1 if you need time-based ordering. Use UUID v7 for modern applications requiring time-ordered, sortable IDs. UUID v4 is generally recommended for distributed systems.

Is UUID v7 better than v4?

UUID v7 provides time-ordered UUIDs that are sortable by creation time, which can improve database indexing performance. UUID v4 provides pure randomness. Choose v7 if you need sortable IDs, otherwise v4 is perfectly fine.

Can I use UUIDs as primary keys in databases?

Yes, UUIDs are commonly used as primary keys in databases. They're especially useful in distributed systems where multiple services generate records independently. Most databases (PostgreSQL, MySQL, MongoDB) have native UUID support.