UUID/GUID Generator

What is this tool?

The ToolFreeOnline UUID Generator is a free, locally-running utility that allows developers to instantly create cryptographically secure UUIDs (Universally Unique Identifiers), specifically version 4 UUIDs.

How to use it?

Using the tool is straightforward. By default, a new UUID is generated when you load the page. You can generate additional UUIDs by clicking the "Generate New UUID" button. To use the generated UUID in your application, click the "Copy" button next to the UUID string, and it will be copied to your clipboard. You can also generate multiple UUIDs at once using the bulk generation feature.

Use Cases

Database Keys: Use UUIDs as primary keys in your databases to ensure uniqueness across distributed systems without relying on auto-incrementing integers.
Session IDs: Generate secure, random tokens for identifying user sessions in web applications.
Transaction IDs: Track individual transactions or requests in microservice architectures.
File Naming: Avoid file name collisions by appending or using UUIDs when saving user-uploaded files to storage.

Frequently Asked Questions

What is a UUID used for?

A UUID (Universally Unique Identifier) is primarily used to uniquely identify information in computer systems. Developers use them as database keys, session identifiers, and transaction tracking tokens because they do not require a central authority to guarantee uniqueness.

How random is a generated password?

Our passwords are generated using cryptographically secure random number generators provided by your browser's Web Crypto API. This ensures extremely high entropy, making the generated passwords virtually impossible for attackers to guess or brute-force.

Is UUID v4 unique every time?

Yes, a version 4 UUID is generated using completely random numbers. The number of possible v4 UUIDs is so astronomically large (2^122) that the probability of generating a duplicate—known as a collision—is practically zero.

What makes a password strong?

A strong password is long (typically 16+ characters) and includes a random mix of uppercase letters, lowercase letters, numbers, and special symbols. It should never contain dictionary words, personal information, or sequential patterns.

Can I generate multiple UUIDs at once?

Yes. Our tool allows you to generate UUIDs in bulk. You can specify the exact number of identifiers you need, and the tool will instantly generate a list that you can copy to your clipboard in one click.

Is this password generator safe to use?

Absolutely. Everything runs locally in your web browser using JavaScript. We never transmit the passwords or UUIDs you generate over the internet, and we do not store them on any servers, ensuring total privacy.

What is the difference between UUID and GUID?

There is practically no structural difference between them. GUID (Globally Unique Identifier) is simply Microsoft's implementation and terminology for the standard UUID. A v4 UUID works perfectly in systems expecting a GUID.

// Single UUID v4

// Bulk Generation