UUID Generator

About UUID Generator

Generate cryptographically random UUID version 4 identifiers for database primary keys, API resources, distributed systems, and any place you need a unique identifier without a central authority. Generate a single UUID or a batch of hundreds at once, and copy them as plain text. UUIDs use 122 bits of randomness drawn from the Web Crypto API, so the chance of two generated values colliding is effectively zero. Everything runs in your browser.

How To Use

  1. Open the generator — a fresh UUID v4 is ready immediately.
  2. Set a batch size if you need more than one, then generate to get that many unique identifiers at once.
  3. Copy a single value or the whole list, ready to paste into a database seed, API fixture, or config file.

Example

Input: A need for 5 unique primary keys to seed a test database.

Output: Five v4 UUIDs such as 3f50b8c2-9d1a-4e7b-8a6f-2c1d9e0b4a77, each drawn from the Web Crypto API.

Who Uses UUID Generator

  • Developers who prefer private, browser-only tools for formatting, validation, and data work.
  • Engineers who need fast local tools without installing anything or uploading code.
  • Teams that want private — files and text stay on your device and are never uploaded to a server.

Frequently Asked Questions

What is a UUID used for?

A UUID (Universally Unique Identifier) is a 128-bit identifier used as a primary key in databases, a resource ID in APIs, a filename for uploads, and anywhere you need a unique value without coordinating with a central server.

What is the difference between UUID and GUID?

They are effectively the same thing — GUID (Globally Unique Identifier) is Microsoft's name for the UUID standard. This generator produces standard UUID v4 values that work as either.

Are the generated UUIDs really unique?

Yes. UUID v4 uses 122 bits of cryptographic randomness, making the probability of a collision so small it can be treated as zero for any realistic volume.

Can I generate many UUIDs at once?

Yes. Choose a batch size and the generator produces that many UUIDs in one click, ready to copy as a list.

More Links