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UUID Generator
Generate cryptographically random version-4 UUIDs using your browser's secure random source. Choose how many, UPPERCASE or lowercase, with or without hyphens — then copy them all in one click.
About UUIDs
A UUID is a 128-bit identifier written as 32 hex digits in five groups, like 3f8a2c1e-…. In version 4, 122 of the bits are random, making collisions effectively impossible — you could generate a billion UUIDs a second for years and still almost certainly never repeat one. That is why UUIDs are the standard primary keys for distributed databases and APIs, where no central counter exists. GUID is simply Microsoft's name for the same thing.
Frequently Asked Questions
Are these UUIDs really unique?
They are generated from your device's cryptographic random generator (crypto.randomUUID). The chance of a duplicate is astronomically small.
UUID vs GUID — what is the difference?
None in practice. GUID is Microsoft's term for a UUID.
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