Generate random version 4 UUIDs (Universally Unique Identifiers).
Generate universally unique identifiers (UUIDs) instantly with our free UUID Generator. This tool creates standard Version 4 (random) UUIDs commonly used in software development, databases, and system architecture to uniquely identify information without a central coordination authority.
Generates valid Version 4 UUIDs that follow the standard format (8-4-4-4-12 hexadecimal digits).
Generate up to 50 UUIDs at once for populating databases or testing datasets.
Simple interface allows you to copy all generated IDs with a single click.
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. The term GUID (Globally Unique Identifier) is also used, typically in Microsoft systems.
A standard UUID looks like this: 123e4567-e89b-12d3-a456-426614174000.
The probability of a collision (generating the same UUID twice) is so astronomically low that for all practical purposes, every UUID generated is unique.
Using UUIDs as primary keys allows records to be created on disconnected systems without conflict.
Tracking user sessions in web applications securely.
Ensuring uploaded files have unique names to prevent overwriting.
Generating mock data for development environments.
Yes, Version 4 UUIDs use random numbers. With 122 bits of randomness, the chance of a collision is negligible (1 in 2.71 quintillion).
Version 1 is time-based (uses current time and MAC address), while Version 4 is purely random. V4 is preferred for privacy as it doesn't reveal the MAC address.
Yes, the UUIDs are generated locally in your browser using JavaScript's random number generator. No data is sent to our servers.