A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. It is formatted as a 36-character alphanumeric string, including four hyphens.

UUID version 4 is a specific type of UUID that is generated using random or pseudo-random numbers, making it incredibly unlikely that any two generated UUIDs will ever be identical.

Frequently Asked Questions About UUIDs

Q: Are UUIDs generated in my browser?

Yes. Our tool is 100% client-side. The UUIDs are generated by your web browser's cryptography API. We do not generate them on our server, nor do we store them.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. It is typically formatted as a 36-character alphanumeric string, formatted like 8-4-4-4-12 (e.g., 123e4567-e89b-12d3-a456-426614174000).

What is UUID v4?

UUID version 4 is a type of UUID generated strictly using random data. Because the number of possible random combinations is astronomically huge (2¹²²), the chance of two identical UUID v4 values being generated (a "collision") is practically zero.

What is the difference between UUID and GUID?

Functionally, there is very little difference. "GUID" (Globally Unique Identifier) is simply the term historically used by Microsoft for identifiers that conform to the UUID standard. In modern development, they are often used interchangeably.

Are UUIDs generated in my browser?

Yes. This tool is completely client-side. When you click generate, your browser runs a JavaScript function utilizing crypto.randomUUID() to create the string locally. We do not use a backend server to generate them.

Does this UUID Generator store generated UUIDs?

No. We do not transmit, log, or store the UUIDs you generate. Your privacy and data security are guaranteed because the generation happens offline within your browser session.

Can I generate multiple UUIDs at once?

Yes! Our UUID Generator allows you to input a quantity (up to 1,000) and generate them instantly in a list.

Can I download the generated UUIDs?

Yes. After generating multiple UUIDs, you can click the "Download TXT" button to save the entire list as a standard text file to your local device.

Can UUID v4 be used as a database identifier?

Yes, UUIDs are widely used as primary keys in distributed databases. However, because UUID v4 is completely random, it is not "sequential." In certain relational databases (like older versions of SQL Server), using non-sequential UUIDs as clustered indexes can lead to performance fragmentation. In those specific architectures, sequential identifiers or specialized UUID types may be preferred.