UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value that's virtually guaranteed to be unique, no matter where or when you generate it. This tool generates UUIDs following version 4 of the RFC 4122 standard, the most widely used variant: 122 of the 128 bits are random, with the rest fixed to mark the version and variant. Everything happens entirely client-side in your browser using the Web Crypto API — nothing is sent to our server, nothing is stored, and no account is required. Generate one or hundreds at once and copy them with a single click.
What people use this for
550e8400-e29b-41d4-a716-4466554400006ba7b810-9dad-41d1-80b4-00c04fd430c8f47ac10b-58cc-4372-a567-0e02b2c3d479
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What is a UUID?
A UUID (Universally Unique Identifier) is a standardized, 36-character identifier (for example 550e8400-e29b-41d4-a716-446655440000) used to uniquely label records, objects, or sessions without needing a central database to track which values have already been issued. They're widely used as database primary keys, API request IDs, and file or session identifiers.
Is a UUID v4 really unique?
With 122 random bits, the chance of a collision is negligibly small: even generating billions of UUIDs per second, it would practically take thousands of years before the probability of a duplicate became meaningful. For virtually any practical use case — from database IDs to tracking tokens — UUID v4 is unique enough to treat as effectively guaranteed.
Are my generated UUIDs stored anywhere?
No. Generation happens entirely locally in your browser via your device's Web Crypto API. Nothing is sent to any Westcube server (or anyone else's), nothing is logged, and nothing is retained. Close the tab and the UUIDs are gone — unless you've copied or saved them yourself.
Why use UUIDs instead of a sequential number?
A sequential number (1, 2, 3, ...) reveals how many records you have and is easy to guess, which is useful for attackers trying to enumerate IDs. UUIDs are unguessable, can be generated on multiple servers simultaneously without any central coordination or collision risk, and are therefore the default choice in distributed systems and modern APIs.