UUID Generator

Generate RFC 4122 compliant UUID v4 unique identifiers instantly in your browser.

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Frequently asked questions

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. UUID v4 is randomly generated and has a collision probability so low it is effectively unique.
Are UUIDs truly unique?
UUID v4 uses 122 random bits, giving 2^122 possible values. The probability of a collision is astronomically low — you would need to generate billions per second for millions of years before a collision became likely.
Are UUIDs generated securely?
Yes. Generation uses window.crypto.getRandomValues() which is a cryptographically secure random number generator built into modern browsers.