UUID generator
Generate random version-4 UUIDs, one or hundreds at a time.
How to use
- Set how many UUIDs you need (up to 1000).
- Copy the generated list, one UUID per line.
- Click Regenerate any time for a fresh batch.
Frequently asked questions
What does version 4 mean?
The UUID is generated from random bits (122 of them), rather than from a timestamp or hardware address. The "4" in the third group marks the version.
Can two generated UUIDs ever collide?
The probability is vanishingly small — you would need to generate billions per second for decades to have a meaningful chance of one duplicate.
Are these UUIDs generated securely?
They use the browser's cryptographic random source (crypto.randomUUID), and they never leave your device.
About this tool
A UUID (universally unique identifier) is a 128-bit value like 550e8400-e29b-41d4-a716-446655440000, designed so that anyone can generate identifiers without coordination and still never collide. Developers reach for them as database keys, request IDs, file names and test fixtures. This generator produces version-4 (random) UUIDs using the browser's cryptographically secure random source — the same crypto.randomUUID() API your production code would use. Set how many you need, copy the list, and regenerate for a fresh batch.