UUID Generator

Generate one or more random UUID v4 identifiers, commonly used for unique database keys, session tokens and object identifiers.

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How It Works

What is a UUID v4

A UUID (Universally Unique Identifier) is a 128-bit value typically written as 32 hexadecimal characters split into five groups, such as 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated using random or pseudo-random numbers, making collisions (two identical UUIDs) astronomically unlikely even across billions of generated values.

Common uses for UUIDs

UUIDs are commonly used as database primary keys, session identifiers, API request tracking IDs, and unique object references in distributed systems, anywhere a unique identifier is needed without coordinating with a central authority.

Frequently Asked Questions

Are these UUIDs guaranteed to be unique?

UUID v4 uses randomness that makes collisions extremely unlikely in practice, though not mathematically impossible, this is the standard used across most production systems.

Is this generated securely in my browser?

Yes, this uses your browser's built-in cryptographically secure random number generator when available, and never sends any data to a server.

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