🆔 UUID Generator – Generate Universally Unique Identifiers Instantly

Use our free, browser-based UUID Generator to instantly create UUID v4 values for use in databases, APIs, distributed systems, and more. Each UUID is randomly generated and guaranteed to be globally unique.

No installation. No tracking. No server. Just secure, standards-compliant UUIDs generated directly in your browser.

📘 What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit number used to uniquely identify information across systems. It is formatted as a 36-character string (including hyphens), following this standard structure:

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

• M represents the version (v4 = randomly generated)
• N indicates the variant (usually 8, 9, a, or b)

Example UUID v4:

f47ac10b-58cc-4372-a567-0e02b2c3d479

Each generated UUID is statistically guaranteed to be unique—even across different machines and time zones.

🧪 Why Use UUIDs?

UUIDs solve many problems:

• 🔄 Avoid collisions in distributed systems
• 🧩 Generate IDs without requiring central coordination
• 🧱 Use as database primary keys or object identifiers
• 🔐 Mask incremental or sensitive internal IDs

They're especially useful when you're building:

• APIs
• Microservices
• NoSQL databases
• User sessions or tokens
• Message queues and event logs

🛠️ How the UUID Generator Works

This tool generates UUIDs using the UUID v4 (random) format, which relies on secure random values from the Web Crypto API ( crypto.getRandomValues() in JavaScript).

Key features:

• ✅ Generates RFC 4122–compliant UUID v4 strings
• 🔒 Fully local – no data sent or received
• ⚡ Instant results with copy-to-clipboard support
• 🧪 Option to generate multiple UUIDs at once

🚀 How to Use the Tool

1. Select how many UUIDs you want to generate (up to 10,000).
2. Click the “Generate UUID” button.
3. Instantly view your UUIDs in the result area.
4. Use the Copy button to export the results for use in your code or database.

The tool ensures that every UUID is generated securely, correctly, and with zero duplication risk.

🔍 Example UUIDs

Here are a few examples of what UUID v4 values look like:

d1c4b85f-5030-4ae5-b4b0-2a2c5e3d391b

3c77476e-6bfc-4a8b-982f-8db4f22c9840

60be1254-9f17-4eb9-9f82-b9d1243c8ef3

These UUIDs can be used as unique references in distributed applications, across databases, or within URLs.

🔗 UUID Versions Explained

Version	Generation Method	Use Case
v1	Time-based	Legacy systems, MAC address
v3	Name-based (MD5)	Deterministic, namespacing
v4	Random-based	General use, safest for uniqueness
v5	Name-based (SHA-1)	Similar to v3, with SHA-1

This tool focuses on UUID v4, which is the most widely used and safest option for most applications.

🧰 Use Cases for UUIDs

• 🗃️ Database document or row identifiers (PostgreSQL, MongoDB)
• 🧾 Order, transaction, or invoice numbers
• 🔐 Session IDs or authentication tokens
• 🧱 Microservice resource keys
• 🌐 Public-facing URLs (e.g., /user/3c77476e-6bfc...)
• 🧪 Test data or fixture IDs in QA/dev environments

❓ Frequently Asked Questions (FAQ)

Are UUIDs really unique?

Yes. UUID v4 uses 122 bits of random data, which offers 5.3×10³⁶ unique combinations—so the odds of collision are astronomically low.

Is this UUID v4?

Yes. All UUIDs generated by this tool follow the UUID version 4 (random-based) format and RFC 4122 compliance.

Can I generate UUIDs offline?

Yes. Once the page is loaded, the tool will continue to work even without internet access.

Is this tool secure?

Absolutely. UUIDs are generated using your browser’s crypto.getRandomValues() API — no data leaves your machine.

Can I use UUIDs in URLs?

Yes. UUIDs are URL-safe and do not require encoding. They're ideal for identifiers in RESTful APIs.

🔒 UUIDs vs Incremental IDs

Feature	UUID	Incremental ID
Uniqueness	Globally unique	Only locally unique
Predictable?	❌ No	✅ Yes
Sortable?	❌ Not naturally	✅ Yes
Leaks information?	❌ No	✅ Yes (can expose count or pattern)
Use in APIs	✅ Recommended	❌ Risky

Use UUIDs when security, anonymity, and cross-system uniqueness are important.

🔗 Related Tools

• MD5 Generator
• SHA256 Generator
• Password Generator
• MongoDB ObjectId Generator
• Base64 Encoder

📌 Final Thoughts

Whether you're building an API, assigning identifiers, or just need a quick set of unique values, this UUID Generator is a fast and secure way to get the job done. It's 100% browser-based, reliable, and ideal for developers working on distributed systems, data modeling, or testing environments.

💡 Bookmark this tool and use it any time you need to create UUIDs for your projects — instantly and securely.