UUID Generator – Generate Random UUID v4 Online

UUID v4 generator – Free Online Tool

Our free UUID v4 Generator creates random universally unique identifiers in one click. Use them as database keys, API IDs, file names or anywhere your software needs an ID that will never clash.

What is UUID v4 generator?

A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value written as 36 characters, for example 550e8400-e29b-41d4-a716-446655440000.

Version 4 UUIDs are built from random numbers. There are so many possible values (about 5.3 × 10³⁶) that the chance of generating the same one twice is practically zero, so systems can create IDs independently without a central counter.

How to use the UUID v4 generator

1. Open the tool — a fresh UUID is generated.
2. Click generate to create a new one whenever you need it.
3. Copy the UUID with one click.
4. Paste it into your code, database or configuration.

Key features

• RFC 4122 compliant version 4 UUIDs
• Cryptographically random values
• One-click copy
• Free and unlimited

Common use cases

• Primary keys in databases
• Unique IDs for API resources and messages
• Session, order or transaction identifiers
• Unique file names for uploads

Frequently asked questions

What is the difference between UUID and GUID?

They are the same concept; GUID is Microsoft’s name for a UUID.

Can two UUID v4 values be the same?

In theory yes, but the probability is so low it can be ignored in real systems.

Is a UUID secure as a secret token?

A UUID is unique but not designed as a secret. Use a dedicated random token for passwords or API secrets.

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