UUID Generator

Bulk-generate random UUID v4 identifiers with one click. Generate up to 100 random UUID v4 identifiers at once. Uppercase, braces and no-hyphen formatting options. Free online UUID builder.

This interactive tool needs JavaScript enabled. All calculations run locally in your browser — nothing is ever uploaded.

This tool runs 100% in your browser. Your input is never sent to any server — you can even go offline after the page loads.

About the UUID Generator

A UUID (universally unique identifier) is a 128-bit label that is, for practical purposes, guaranteed unique without any central coordination — which is why databases, APIs and distributed systems lean on it. This generator uses your browser's cryptographically secure random source (crypto.getRandomValues) to produce RFC 4122 version-4 UUIDs, in bulk, with formatting options for every convention: standard lowercase, uppercase, braces for Microsoft GUIDs, or hyphen-free compact form.

How to use the UUID Generator

Choose how many UUIDs you need.
Pick a formatting option if your stack needs one.
Click Generate.
Copy a single UUID or the entire list.

Key features

True random v4 UUIDs via crypto.getRandomValues
Generate 1 to 100 at a time
Uppercase, braces and no-hyphen formats
Copy the whole batch in one click

How unique is a random UUID really?

A v4 UUID has about 122 random bits. The chance of two ever colliding is so small you could generate a billion per year for centuries and still not expect a single duplicate.

What is the difference between a UUID and a GUID?

Practically none — GUID is Microsoft's name for the same 128-bit identifier. The braces format option exists for Microsoft-style GUIDs.

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