UUID Generator

Generate unique identifiers (UUIDs/GUIDs) using cryptographically secure random numbers.

Unique IDs instantly

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Generated UUIDs

Click "Generate" to create UUIDs

About This Tool

UUID (Universally Unique Identifier) is a 128-bit identifier used in software development. Version 4 UUIDs are generated using random numbers per RFC 4122. The v1-style option is time-based but not RFC-compliant — it packs the current timestamp with random bytes instead of the RFC 4122 v1 Gregorian timestamp, clock sequence, and node fields. This tool uses the Web Crypto API for secure random number generation.

About

About the UUID Generator

The UUID Generator creates universally unique identifiers (UUIDs, also called GUIDs) on demand, right in your browser. Reach for it whenever you need a collision-free ID for a database row, an API request, a test fixture, a message key, or a file name, without spinning up code or a database sequence to get one. Because it runs entirely client-side, every UUID is generated locally on your device and is never sent to or stored on a server.

How to use the UUID Generator

  1. 1Open the UUID Generator page in your browser.
  2. 2Choose the format or version you need, if the tool offers options.
  3. 3Click generate to produce a fresh UUID (or a batch, if supported).
  4. 4Copy a value with the copy button.
  5. 5Paste it into your code, config, or database, and generate again whenever you need another.

Common use cases

  • Generating primary keys for database records without a server round-trip
  • Creating unique IDs for API resources, requests, or idempotency keys
  • Producing distinct identifiers for test fixtures and seed data
  • Naming files or assets so they never clash
  • Assigning session, trace, or correlation IDs while debugging

Frequently asked questions

What is a UUID?

A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value usually written as 32 hexadecimal digits in five hyphen-separated groups, like 550e8400-e29b-41d4-a716-446655440000. It is designed so that IDs generated independently are extremely unlikely to ever collide.

Is this UUID generator free?

Yes. It is completely free to use with no sign-up, and you can generate as many UUIDs as you need.

Is my data private and safe?

Yes. The generator runs 100% in your browser. UUIDs are created locally on your device, and nothing is uploaded, stored, or tracked, so the values never leave your machine.

Are the generated UUIDs really unique?

In practice, yes. Random UUIDs draw from such a vast value space that the chance of generating the same one twice is negligibly small, which is why they are safe to use as identifiers without a central coordinator.

What can I use a UUID for?

Common uses include database primary keys, API resource IDs, idempotency and message keys, session or correlation IDs, unique file names, and identifiers in test data.

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