Dev
UUID Generator (v1–v8)
UUID Version
Select the UUID version to generate.
V4 — Random (recommended)
Options
All UUIDs generated locally in your browser. Maximum 10,000 per run.
Result
Generate UUIDs to see the results.
Frequently Asked Questions
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in five groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. It is designed to be globally unique without requiring a central registry or coordination.
What is the difference between UUID v1 and UUID v4?
UUID v1 uses the current timestamp and the device's MAC address — making it time-ordered but traceable. UUID v4 uses purely random numbers — making it untraceable and the recommended choice for most applications where privacy or security matters.
Can two UUIDs ever be the same?
Theoretically possible, practically impossible. UUID v4 has 2^122 possible values (~5.3 × 10^36). If you generated one billion UUIDs per second, it would take hundreds of billions of years to statistically likely produce a collision.