How likely is a UUID collision?

For Version 4 UUIDs, the probability of a collision is astronomically small — effectively negligible for any practical application.

What is the difference between a UUID and a GUID?

They are functionally the same concept; GUID is Microsoft's term, traditionally formatted with braces and uppercase — see the dedicated GUID Generator tool.

Is my generated UUID sent anywhere?

No — it is generated and displayed entirely in your browser.

Can I generate more than 100 UUIDs at once?

The tool is capped at 100 per generation — run it again for more.

Are these UUIDs suitable for security tokens?

Version 4 UUIDs use a cryptographically secure random source, making them reasonable for many token uses, though dedicated token-generation schemes may be preferable for high-security contexts.

Do UUIDs need to be globally registered?

No — that is the point of a UUID: it can be generated independently, anywhere, without registering it with any authority.

Identifier & Random Tools

UUID Generator

Generate cryptographically random Version 4 UUIDs for use as unique identifiers in code, databases or config files.

Start Using This Tool

Runs in Your Browser
Instant Results
100% Private

How many

Uppercase Include hyphens

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What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value, typically written as 32 hexadecimal digits in five groups (like 3f2504e0-4f89-11d3-9a0c-0305e82c3301), designed so that generating one independently, anywhere, is astronomically unlikely to collide with any other UUID ever generated.

Version 4 UUIDs — the kind this tool generates — are built from random bits, making them the simplest and most common way to create unique identifiers for database records, API resources, session tokens and file names without needing a central authority to hand them out.

Who Uses This Tool?

For Business

Generate unique identifiers for new database records or API resources.

For Personal Use

Generate a unique ID for a personal project or file naming scheme.

For Students

Learn how UUIDs work for a databases or distributed systems course.

For Offices

Generate unique reference numbers for internal tracking.

Why Use This Tool

Key Features

Bulk Generation

Generate up to 100 UUIDs at once.

Format Options

Toggle hyphens and uppercase formatting.

Cryptographically Random

Uses your browser's Web Crypto API for true randomness.

100% Private

Generated entirely in your browser — nothing is transmitted.

The Payoff

Benefits

No Collisions in Practice

Random UUIDs are effectively guaranteed to be unique across systems.

No Central Authority Needed

Generate unique IDs independently, without coordinating with a server.

Generate in Bulk

Create many UUIDs at once for seeding test data.

Step by Step

How to Use UUID Generator

Set Quantity & Format

Choose how many UUIDs and whether to include hyphens or uppercase.

Click Generate UUID

New random UUIDs appear instantly.

Copy the Result

Use the Copy button to grab all generated UUIDs.

Specifications

Technical Details

Detail	Value
Input	Generated text output, no input required
Processing	Up to 100 UUIDs per generation
Output	Version 4 (random) UUIDs using your browser's Web Crypto API

You Can Verify This

Privacy & Security

What actually happens to your file when you use this tool.

100% Client-Side

This tool runs entirely inside your browser using JavaScript — nothing you type or generate is ever sent anywhere.

No Upload, Ever

There is no file upload and no server processing step — your data never leaves your device.

Works Offline

Once this page has loaded, the tool keeps working even without an internet connection.

Nothing Stored

Nothing you enter is saved on our servers — refreshing the page clears everything.

No Tracking of Your Input

We have no way to see what you type, generate or convert with this tool.

Get Better Results

Tips

Use as Primary Keys Carefully

UUIDs make great unique identifiers, though they take more storage than sequential integers.

Remove Hyphens for Compact Storage

Disable hyphens if a system expects a 32-character hex string without separators.

Frequently Asked Questions