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Generate cryptographically secure version 4 UUIDs instantly. Free, private, and browser-based.
UUID/GUID Generator
Generate cryptographically secure v4 UUIDs instantly.
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Why use our UUID Generator?
Instant Generation
Generate up to 500 UUIDs instantly in a single click.
Cryptographically Secure
Uses the browser's native Crypto API to generate truly random, secure v4 UUIDs.
Customizable Output
Toggle hyphens and switch between uppercase and lowercase letters easily.
100% Private
All generation happens strictly within your browser. Nothing is ever sent to a server.
What is a UUID?
How to Generate UUIDs
Frequently Asked Questions
What is a UUID?
UUID stands for Universally Unique Identifier. It is a 128-bit number used to uniquely identify information in computer systems. A UUID looks like this: 123e4567-e89b-12d3-a456-426614174000.
What is the difference between UUID and GUID?
There is no practical difference. GUID (Globally Unique Identifier) is simply Microsoft's implementation and specific terminology for the UUID standard.
What version of UUID does this tool generate?
This tool generates Version 4 UUIDs. v4 UUIDs are created using pseudo-random numbers and are the most common standard used in web and software development today.
Are the generated UUIDs truly unique?
While mathematically possible to have a collision (generating the same UUID twice), the chances are unimaginably small. Generating 1 billion UUIDs every second for 85 years would only result in a 50% chance of a single collision.