UUID Generator

Need unique identifiers for your app, database, or software project? This free UUID Generator lets you create UUID v4 identifiers in seconds. Choose how many UUIDs you need, customize their format, use uppercase letters, and copy or download your results with ease. Everything runs directly in your browser, with no registration required.

UUID Generator

Generate unique UUIDs online for testing, development, databases, and more.

UUID v4 uses randomly generated bits with the required version and variant bits.
Generate between 1 and 10,000 UUIDs in one batch.
Quick tip: A standard UUID contains 36 characters, including hyphens. UUID v4 has 122 random bits after its version and variant bits are set.

Generated UUIDs

Your generated identifiers will appear below. Copy or download them when ready.

0 UUIDs

Choose your settings and click Generate UUIDs.

UUIDs are generated in your browser using the Web Crypto API. Results are not sent to a server by this tool.

What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value used to identify information, records, objects, and resources in computer systems. UUIDs are commonly used in databases, web applications, APIs, and software development to give items their own identifiers.

A standard UUID looks like this:

550e8400-e29b-41d4-a716-446655440000

It contains 32 hexadecimal characters separated by four hyphens. UUIDs are designed to make accidental duplication extremely unlikely when generated correctly.

What Is a UUID v4?

UUID v4 is a popular UUID version that uses random values to create identifiers. Certain bits are reserved to identify the version and variant, while the remaining bits provide randomness.

Developers often use UUID v4 for database records, application resources, test data, and identifiers that should not depend on a sequential numbering system.

How to Use the UUID Generator

Using this free tool is simple:

  1. Choose the UUID version. The generator currently supports UUID v4.
  2. Enter the number of UUIDs you want to create.
  3. Select your preferred format, such as standard UUIDs, UUIDs without hyphens, or UUIDs inside curly braces.
  4. Enable uppercase letters if you prefer capital letters.
  5. Click Generate UUIDs to create your identifiers.
  6. Copy your results or download them as a text file.

You can restore the default settings or clear your results whenever you want to start again.

Common Uses of UUIDs

UUIDs are useful in many technical situations, including:

  • Databases: Assign identifiers to users, products, orders, and other records.
  • Web development: Identify application resources and objects.
  • API development: Create identifiers for data exchanged between systems.
  • Software testing: Generate sample identifiers for development and testing.
  • Distributed systems: Create identifiers across multiple services without relying on one central numbering sequence.

Generate UUIDs Online for Free

Our free UUID Generator makes it easy to create UUID v4 identifiers without installing extra software. Generate multiple UUIDs at once, customize the output, and save the results for your project.

The generator uses your browser’s Web Crypto API for random number generation. The identifiers are generated locally by the tool and are not sent to a server by its code.

Note: UUIDs are designed to have an extremely low probability of accidental collision, but they are not guaranteed to be globally unique. UUIDs should not be used as a substitute for authentication, secret tokens, or access-control mechanisms.

Related Tools

Scroll to Top