UUID Generator
Generate random v4 UUIDs in your browser — no data leaves your machine.
What is a UUID v4?
A UUID (Universally Unique Identifier) version 4 is a 128-bit value generated from random numbers. Collisions are astronomically unlikely, which makes v4 UUIDs a practical way to generate unique IDs without a central authority.
Common uses
- Generating primary keys for a database table
- Creating unique request or trace IDs for logging and debugging
- Generating placeholder IDs for test fixtures or seed data
FAQ
Are these cryptographically secure?
Yes — they’re generated with the browser’s crypto.randomUUID() (Web Crypto API), not Math.random().
Why v4 specifically?
v4 is fully random-based and needs no coordination, unlike v1 (which encodes a MAC address and timestamp) — that makes it the most common choice for general-purpose unique IDs.
Can I generate more than 100 at once?
The tool caps it at 100 per click to keep the output manageable — run it again for more.