UUID Generator
Generate cryptographically secure version 4 UUIDs in bulk.
Generate Secure UUIDs
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value used to label information without a central authority. This generator produces version 4 UUIDs using your browser's cryptographically secure random number generator, so collisions are effectively impossible.
What is a version 4 UUID?
A v4 UUID is generated almost entirely from random bits, with a few fixed bits identifying the version and variant. It looks like 123e4567-e89b-42d3-a456-426614174000 and contains 122 bits of randomness.
Common uses
- Primary keys in databases
- Idempotency and request IDs in APIs
- Correlation IDs for distributed tracing
- Unique file and resource names
Why UUIDs instead of auto-increment IDs?
UUIDs can be generated independently on any machine without coordinating with a database, which makes them ideal for distributed systems, offline-first apps, and merging data from multiple sources. Because they are unguessable, they also avoid leaking how many records exist.
100% Private & Processed Locally
Every UUID is generated entirely in your browser using the Web Crypto API. Nothing is sent to a server, so the identifiers are yours alone and the tool works even offline.
Frequently Asked Questions
Common questions about the UUID Generator.