Can two generated UUID v4s ever collide?

The mathematical chance of generating a duplicate UUID v4 is so infinitesimally small (1 in 2^122) that collisions in real-world systems are virtually non-existent.

Are UUIDs suitable for database primary keys?

Yes, especially in distributed microservices where multiple servers generate database records concurrently without centralized auto-increment counters.

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UUID Generator

Generate cryptographically secure version 4 UUIDs (Universally Unique Identifiers).

UUID Generator

Create cryptographically secure universally unique identifiers (v4).

Quantity:

Hyphens

Uppercase

Generated UUIDs

Key Features

Cryptographically secure Version 4 (v4) random UUID generation

Batch generation of up to 100 UUIDs simultaneously

Toggle uppercase/lowercase formatting and hyphen inclusion

Instant one-click bulk copy for database seeding and fixtures

How to Use the UUID Generator

Select how many UUIDs you want to create (single or bulk).

Choose your formatting options (hyphens, casing).

Click "Generate" or copy generated unique keys directly into your database schema.

Examples

Standard UUID v4

A 128-bit label with 122 bits of cryptographically random entropy.

Input / Scenario:

Generate 1 UUID v4

Output:

f47ac10b-58cc-4372-a567-0e02b2c3d479

What is a UUID and When Should You Use Version 4?

A Universally Unique Identifier (UUID) is a 128-bit label used for identification in computer systems. Version 4 UUIDs rely on pseudo-random numbers generated via cryptographically strong random algorithms (`crypto.getRandomValues`), guaranteeing that collision probability is negligible across distributed databases.

Compare UUID standards: UUID v4 vs UUID v7