A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUID v4 is generated using random or pseudo-random numbers and is the most commonly used version.

How random is a UUID v4?

UUID v4 uses 122 bits of randomness, providing approximately 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically low, making them safe for most applications.

What is the difference between UUID and GUID?

UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is the term used by Microsoft, while UUID is the standard term defined in RFC 4122. The format and generation methods are identical.

Can I generate multiple UUIDs at once?

Yes! Use the bulk generation feature to generate up to 100 UUIDs at a time. You can copy all of them to your clipboard with one click.

Is my data stored or sent to a server?

No. All UUIDs are generated entirely in your browser using the Web Crypto API. Nothing is saved or transmitted to any server.

UUID Generator

Generate random UUID v4 identifiers instantly. Bulk generate up to 100 UUIDs and copy them to your clipboard. All generation happens in your browser — nothing is sent to any server.

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What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUID v4 uses cryptographic randomness to generate identifiers that are virtually guaranteed to be unique, making them ideal for database keys, session tokens, and distributed systems.