UUID Generator (v4)
Generate truly random UUIDs using your browser's cryptographic engine — one or five hundred at a time. Perfect for database keys, request IDs, and test data.
UUIDs are v4 (random), generated locally with crypto.randomUUID() / crypto.getRandomValues(). Nothing ever leaves your device.
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How to use
- Choose how many UUIDs you need (1–500).
- Pick formatting: uppercase, no-dashes, or braces.
- Copy individually or all at once.
Frequently asked questions
Are these UUIDs really random?
Yes. They are generated with crypto.getRandomValues() — the same cryptographic source browsers use for security keys — not Math.random().
Can two UUIDs ever collide?
Practically never. A v4 UUID has 122 random bits; you would need to generate a billion UUIDs per second for 85 years to have a 50% collision chance.
Do you log the UUIDs I generate?
No. Generation happens entirely in your browser — nothing is transmitted or stored anywhere but your screen.