UUID Generator

Version 4 UUIDs carry 122 random bits — collision-safe for keys, IDs and test data. Password generator → · all security tools →

A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value written as 32 hexadecimal digits in five groups (8-4-4-4-12). They are used as database keys, object IDs, correlation IDs and test data because two independently generated UUIDs are, for practical purposes, never the same — no central coordinator needed.

Version 4 UUIDs are random: 122 of the 128 bits come from a random source (the remaining bits fix the version and variant). That gives about 5.3×10³⁶ possible values, so collisions are vanishingly unlikely. This tool generates v4 UUIDs using crypto.getRandomValues / crypto.randomUUID — a cryptographically secure random source, not Math.random.

Not mathematically guaranteed, but the probability of a collision is so small it is ignored in practice — you would need to generate billions per second for many years to have any realistic chance. For almost every application, v4 UUIDs are treated as unique. If you need guaranteed ordering or sortability, look at UUID v7 or a database sequence instead.

Yes. UUIDs are generated entirely in your browser — nothing is sent to our servers, logged or stored, and no third-party scripts are loaded. You can generate up to 100 at once and copy them individually or all together.