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UUID Generator

Generate random UUID v4 (GUID) identifiers instantly.

Count:

Uppercase

fb87d608-d2c2-40b7-87a0-0c792ec38494

Why Use Our UUID Generator?

Free and easy to use.
Generates valid UUID v4 format.
Generate up to 100 UUIDs at once.
Toggle between uppercase and lowercase.
Copy individual or all UUIDs with one click.
Perfect for developers and database administrators.

UUID Format Explanation

UUID v4 follows a specific 36-character format (32 hex digits + 4 hyphens):

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

The 4 indicates version 4, and y is 8, 9, a, or b

Frequently Asked Questions

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across all devices and time. Also known as GUID (Globally Unique Identifier), it's commonly used in databases, distributed systems, and software development.

What is UUID v4?

UUID v4 is a randomly generated UUID. Unlike other versions that use timestamps or MAC addresses, v4 UUIDs are generated using random or pseudo-random numbers, making them ideal for most applications.

Are UUIDs truly unique?

While not mathematically guaranteed to be unique, the probability of generating duplicate UUID v4s is astronomically low (about 1 in 5.3 × 10^36). For practical purposes, they can be considered unique.

What's the difference between UUID and GUID?

UUID and GUID are essentially the same thing. UUID is the standard term used in most contexts, while GUID (Globally Unique Identifier) is Microsoft's implementation and terminology.

Where are UUIDs commonly used?

UUIDs are used as database primary keys, session identifiers, API keys, file names, distributed system identifiers, and anywhere unique identification is needed without central coordination.