UUID / GUID Generator – Free Online Tool

UUID (GUID) Generator

Generate v4 Universally Unique Identifiers.

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What is a UUID / GUID Generator?

A UUID (Universally Unique Identifier) Generator is a developer tool that creates a 128-bit label used for information in computer systems. It ensures that the generated ID is statistically unique across all systems globally, without requiring a central coordination server.

Why We Built This (And Why You Can Trust It)

When building databases or distributed systems, relying on auto-incrementing integers (1, 2, 3) can lead to massive data collisions if databases are ever merged. We built this tool to instantly generate Version 4 UUIDs locally so developers can grab a unique ID for testing or database seeding instantly.

How to Use the UUID / GUID Generator

1. Open the tool, and a fresh UUID will be generated immediately.

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2. Click the 'Generate New UUID' button to create another one.

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3. The tool generates standard 36-character strings (e.g., `123e4567-e89b-12d3-a456-426614174000`).

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4. Click to copy the ID to your clipboard for use in your code.

Common Use Cases

  • **Database Keys:** Assign a globally unique primary key to a new user or product in a NoSQL database.
  • **API Development:** Generate secure, unguessable session tokens or transaction IDs for web requests.
  • **Testing & Mocking:** Quickly seed a test database with realistic, uniquely identifiable data points.

Frequently Asked Questions

What is the difference between UUID and GUID?

Nothing practical. UUID (Universally Unique Identifier) is the standard term, while GUID (Globally Unique Identifier) is simply the term Microsoft coined for the exact same standard. They are interchangeable.

Can a UUID ever be generated twice?

While theoretically possible, the mathematical probability of a random Version 4 UUID colliding with another is so infinitesimally small that it is considered practically impossible. You would need to generate 1 billion UUIDs every second for 85 years to reach a 50% chance of a single collision.

Which version of UUID does this generate?

This tool generates UUID Version 4, which is the most common standard based entirely on random numbers.