Free online UUID generator. Generate random UUIDs (Universally Unique Identifiers) version 4 instantly. Bulk generate multiple UUIDs, copy to clipboard, or download as a file. Perfect for developers, databases, testing, and API keys. Pure client-side, no ads.
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUID v4 is generated using random numbers, making each UUID practically unique. This tool generates UUIDs entirely in your browser — no data is sent to any server.
A UUID (Universally Unique Identifier) is a 128-bit label used to identify information in computer systems. It is designed to be unique across both space and time, making it ideal for database keys, session IDs, and distributed systems.
UUID v4 is the most common version of UUID. It is generated entirely from random numbers, with 122 bits of randomness. The probability of generating two identical UUID v4 values is extremely low — about 1 in 2^122.
UUID v4 generates identifiers using a random number generator. While technically possible for a collision to occur, the probability is so astronomically small that for all practical purposes, each UUID is unique.
Absolutely. All UUIDs are generated locally in your browser using the Web Crypto API. No data is sent to any server or stored anywhere.