Question 1

What is a UUID?

Accepted Answer

A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUIDs are used to identify information in computer systems without requiring central coordination. They're commonly used as database primary keys, session IDs, and for tracking unique items.

Question 2

What is UUID v4?

Accepted Answer

UUID v4 is a randomly generated UUID. It uses random numbers to generate a unique identifier, making collision extremely unlikely (about 1 in 5.3x10^36). UUID v4 is the most commonly used type because it's simple to generate and doesn't require any special information like MAC addresses or timestamps.

Question 3

Are the generated UUIDs truly unique?

Accepted Answer

Yes, practically speaking. UUID v4 uses cryptographically secure random numbers, making the probability of generating the same UUID twice astronomically small. You would need to generate about 2.7 quintillion UUIDs to have a 50% chance of a single collision.

Question 4

What's the difference between UUID and GUID?

Accepted Answer

UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They follow the same format and can be used interchangeably.

Question 5

Can I use these UUIDs in my database?

Accepted Answer

Absolutely! UUIDs are commonly used as primary keys in databases like PostgreSQL, MySQL, MongoDB, and others. They're especially useful in distributed systems where you need to generate unique IDs without a central authority.

Question 6

Is this UUID generator secure?

Accepted Answer

Yes! Our generator uses the Web Crypto API which provides cryptographically secure random numbers. The UUIDs are generated entirely in your browser and never transmitted to any server.

Question 7

What are UUID formats used for?

Accepted Answer

Different formats serve different purposes: Standard format is most common, uppercase is often used in Windows/Microsoft systems, no-hyphens format is useful for URLs and file names, braces format is used in some Microsoft contexts, and URN format is used in XML and other protocols.

Question 8

How many UUIDs can I generate at once?

Accepted Answer

You can generate up to 100 UUIDs at once with our tool. This is useful for bulk operations like seeding databases, creating test data, or preparing multiple unique identifiers.

Free Online UUID Generator

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