A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. The most common format is UUID v4, which is randomly generated.

Are UUIDs truly unique?

UUID v4 uses 122 random bits, giving about 5.3 × 10³⁶ possible values. The probability of a collision is astronomically small.

Is this generated server-side?

No, UUIDs are generated entirely in your browser using the Web Crypto API for secure randomness.

What format options are available?

Standard (with hyphens), no hyphens, uppercase, and braces format ({...}).

UUID Generator

Generate random UUID v4 identifiers instantly. Cryptographically secure, browser-based, and free.

No signup. 100% private. Processed in your browser.

UUID v4 uses 122 random bits for virtually collision-free unique identifiers.

Count

Format

How to use this tool

1

Choose the number of UUIDs to generate

2

Click Generate to create new UUIDs instantly

3

Copy individual UUIDs or all at once

Common uses

Generating unique database primary keys
Creating unique identifiers for API resources
Assigning session or transaction IDs
Producing unique file names to prevent collisions

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