UUID Generator v4Generate UUID v4 values instantly in your browser with fast, private processing.

Number of UUIDs

UppercaseInclude hyphens

What is UUID?

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, particularly in Microsoft systems.

UUID v4 Format

Version 4 UUIDs are randomly generated and have the format:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

The probability of generating duplicate UUIDs is negligibly small, making them ideal for distributed systems.

Common Uses

✓Database Primary Keys: Unique identifiers for records
✓API Request IDs: Track individual API calls
✓Session IDs: Identify user sessions
✓File Names: Generate unique file identifiers
✓Transaction IDs: Track financial transactions
✓Event Tracking: Unique event identifiers

Features

Bulk Generation

Generate up to 100 UUIDs at once

Easy Copy

Copy individual or all UUIDs instantly

Download

Export UUIDs as a text file

Overview

Generate UUID v4 values instantly with a free, online UUID generator that runs entirely in your browser. Create one or hundreds of universally unique identifiers for databases, APIs, test fixtures, and client-side keys without sending data to a server.

UUIDs help developers avoid collisions when creating records across distributed systems. This tool delivers fast, client-side generation so IDs stay private and results appear immediately with no registration. Adjust casing, toggle hyphens, and copy in a single click to keep your workflow moving.

When you need repeatable, consistent IDs for sample data or load testing, bulk generation saves time. You can also generate UUIDs for front-end keys without waiting on backend endpoints or exposing internal services.

Generate UUID v4 in batches up to 100 at a time.
Switch between uppercase and lowercase output.
Include or remove hyphens for compact IDs.
Copy or download UUID lists instantly.

How to Use

Generate IDs on demand and paste them directly into your schema, seed scripts, or API payloads.

Choose how many UUIDs you want to generate.
Toggle uppercase or hyphen options if needed.
Click Generate to refresh the list instantly.
Copy or download the IDs for your project.

Common Use Cases

UUIDs are a safe default when you need uniqueness across systems or environments.

Creating primary keys for database records.
Generating unique IDs for API requests or jobs.
Seeding test data and fixtures quickly.
Creating client-side keys for UI components.

FAQ

Which UUID version is this?

It generates UUID v4 values based on random data. This is the most common version for general use.

Are UUIDs guaranteed to be unique?

They are statistically unique; collisions are extremely unlikely. For most applications, v4 is safe.

Is any data stored or sent?

No. IDs are generated locally in your browser. Nothing is transmitted or stored.