A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems. UUID v4 is randomly generated.

Are UUIDs guaranteed to be unique?

While not mathematically guaranteed, the probability of collision is astronomically low (~1 in 2^122 for v4). For practical purposes, they are unique.

What formats are supported?

Standard lowercase, uppercase, no-dash, braces {uuid}, and URN format (urn:uuid:xxx).

UUID Generator

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