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Home » UUID / GUID Generator

Bulk UUID / GUID Generator (v4)

Generate cryptographically secure, completely random Version 4 UUIDs directly on your device.

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What is a UUID or GUID?

UUID stands for Universally Unique Identifier (Microsoft refers to them as GUIDs, or Globally Unique Identifiers). A UUID is a 128-bit label used for information in computer systems. They are widely used as database primary keys, session IDs, and unique file names.

Why use Version 4 UUIDs?

Our tool specifically generates Version 4 UUIDs. Unlike earlier versions that used your device's MAC address and the exact time of creation (which could lead to privacy leaks and predictability), Version 4 relies entirely on random numbers. By using your browser's native cryptographic API, we ensure that every UUID generated is truly random and virtually impossible to duplicate.

The Math Behind Collisions

The total number of possible V4 UUIDs is 2122 (or about 5.3 x 1036). The probability of generating a duplicate UUID (a collision) is so infinitesimally small that you could generate 1 billion UUIDs every second for 85 years and still have a less than 50% chance of a single collision.