What makes UUID v4 unique?

122 random bits create 5.3×10^36 possible values. The chance of a collision is effectively zero.

Can I use them as database primary keys?

Yes, UUID v4 is widely used as primary keys in PostgreSQL, MongoDB, and other databases.

Are they truly random?

Yes. They use the browser cryptographic random number generator (crypto.getRandomValues).

UUID v4 Generator

Generate cryptographically secure UUIDs v4 instantly. Click to copy any one.

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Free UUID v4 Generator — Unique Identifiers

UUIDs (Universally Unique Identifiers) are 128-bit values used as primary keys in databases, distributed systems, and APIs to ensure each record has a globally unique identifier without requiring centralized coordination. Our generator creates cryptographically random UUID version 4 identifiers that are statistically guaranteed to be unique.

Version 4 UUIDs use random numbers for all significant bits (122 out of 128), making collision probability astronomically low. Generated using your browser Crypto API for true randomness.

How to Use This Tool

Click "Generate" to create a new UUID v4.
Copy the UUID to use in your database or application.
Generate as many as you need — each is guaranteed unique.

Frequently Asked Questions

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