Generate UUIDs (v4) Online — Free, Private, Client-Side
Generate one or thousands of RFC 4122 version 4 UUIDs at once using your browser's cryptographic random source. This free online UUID generator is perfect for database keys, test data, and distributed systems — with no storage and no tracking.
Why this tool is useful
- Create unique IDs for databases and test fixtures.
- Generate many at once for bulk seeding.
- Cryptographically random — collisions are effectively impossible.
How it works (client-side)
- Set how many UUIDs you need.
- Click Generate.
- crypto.randomUUID produces each value locally; copy the list.
Frequently asked questions
Are UUIDv4 collisions possible?
Theoretically yes, but with 122 bits of randomness the odds are astronomically small — safe for any practical use.
How many can I generate at once?
Thousands comfortably; very large counts depend on your device memory.
Are generated UUIDs stored?
No — they exist only in your browser session.