Online UUID / GUID v4 Generator

100% In-Browser & Private

Generate cryptographically secure random UUID v4 (Universally Unique Identifiers) in bulk with custom casing and hyphen formatting.

About UUID / GUID Generator

A UUID (Universally Unique Identifier), also known as a GUID in Microsoft ecosystems, is a 128-bit label used for uniquely identifying information in computer systems. Version 4 UUIDs use cryptographically strong random numbers, ensuring that the probability of generating a duplicate UUID is so low as to be practically negligible.

Key Features & Capabilities

Cryptographically random UUID Version 4 generation
Bulk generation: generate multiple unique UUIDs with one click
Uppercase and lowercase formatting options
Instant copy-to-clipboard for single or multiple UUIDs

How to Use This Tool

  1. 1

    Select options

    Choose the quantity of UUIDs you need and select your preferred formatting.

  2. 2

    Generate UUIDs

    Click generate to obtain fresh, random UUIDs.

  3. 3

    Copy results

    Copy individual UUIDs or all generated UUIDs at once.

Frequently Asked Questions

What are the chances of two UUID v4 values colliding?

The collision probability is astronomically small. You would need to generate approximately 1 billion UUIDs per second for 85 years to have a 50% probability of a single collision.

What is the difference between a UUID and a GUID?

They refer to the same standard. UUID is the standard term (RFC 4122), while GUID (Globally Unique Identifier) is the term primarily used by Microsoft.

Client-Side Security Guarantee: All operations are processed locally in your browser sandbox using web standards. We never record, send, or store your code, data payloads, or tokens on any server.