Dev / ITnew

UUID Generator

Free online UUID generator supporting UUID v1 (time-based), v4 (random), and v5 (namespace-based). Generate single or bulk UUIDs instantly. All generation runs 100% in your browser using the Web Crypto API — no data is sent to any server. Essential for developers needing unique identifiers for databases, APIs, and distributed systems.

random · most common
qty1

UUID VERSIONS

v1Time-based + MAC address. Sortable chronologically.
v4Randomly generated. Most widely used. 122 bits of randomness.
v5SHA-1 hash of namespace + name. Same input = same UUID always.

how to use

  1. 1.Select UUID version: v1 (time-based), v4 (random), or v5 (namespace)
  2. 2.Set the quantity of UUIDs to generate (1-100)
  3. 3.Click Generate or use auto-generate mode
  4. 4.Copy a single UUID or all UUIDs at once

frequently asked

What is the difference between UUID v1 and v4?

UUID v1 is time-based and includes the MAC address, making it sortable but less private. UUID v4 is completely random and is the most commonly used version.

Is UUID truly unique?

UUID v4 has 122 random bits, making collisions astronomically unlikely. The probability of generating a duplicate is negligible for all practical purposes.