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UUID Generator

Generate random UUIDs (v4) instantly. Create single or bulk UUIDs for your projects.

What is a UUID Generator?

A UUID (Universally Unique Identifier) generator creates 128-bit identifiers that are unique across space and time without requiring a central registration authority. UUIDs are the standard for generating unique IDs in distributed systems, databases, APIs, and applications where sequential IDs are impractical or insecure.

Our generator creates Version 4 UUIDs, which are randomly generated using cryptographically secure random numbers. With 122 random bits, the probability of generating a duplicate UUID is astronomically small — you could generate one billion UUIDs per second for 85 years before having a 50% chance of a single collision.

How to Use This UUID Generator

  1. Click “Generate” to create one or more UUIDs instantly
  2. Select the quantity if you need multiple UUIDs at once
  3. Copy individual UUIDs or all of them at once
  4. Use them in your code, database, or configuration files

Common Use Cases

  • Database primary keys — Use UUIDs instead of auto-increment integers for globally unique, non-guessable IDs
  • API resource identifiers — Expose UUIDs in URLs and responses instead of sequential IDs that reveal data patterns
  • Distributed systems — Generate IDs across multiple servers without coordination or collision risk
  • Session tokens — Create unique session identifiers for user authentication
  • File naming — Generate unique filenames for uploads to prevent collisions

Frequently Asked Questions

Should I use UUIDs or auto-increment IDs for my database?

UUIDs are better for distributed systems, security (non-guessable), and merging data from multiple sources. Auto-increment IDs are better for performance (smaller index size, sequential writes) and simplicity. Many teams use UUIDs for public-facing IDs and auto-increment for internal primary keys.

What’s the difference between UUID versions?

V1: Based on timestamp and MAC address (can leak information). V4: Fully random (most common, recommended for general use). V5: Deterministic, generated from a namespace and name using SHA-1. V7: Time-ordered random UUIDs (newer, good for database performance).