UUID Generator
Cryptographically random v4 UUIDs, generated in your browser.
Frequently asked questions
What is a v4 UUID?
A version 4 UUID is a 128-bit identifier generated from random data, formatted as 32 hex digits like 550e8400-e29b-41d4-a716-446655440000. The "4" in the third group marks the version.
Can two v4 UUIDs collide?
Theoretically yes, practically no. With 122 random bits, you would need to generate about 2.7 quintillion UUIDs to reach even a 50% chance of a single collision.
Are these safe for database keys and API IDs?
Yes — that is their most common use. They are generated with crypto.getRandomValues, the browser's cryptographic RNG, and never leave your device.