Generate cryptographically secure random UUID v4 (GUID) values — one or up to 500 at a time, in upper or lower case, with or without hyphens. Copy all in one click.
Your UUID
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They're version 4 UUIDs built from 122 random bits using your browser's secure random generator. The chance of a collision is astronomically small.
Nothing practical — GUID is Microsoft's name for the same 128-bit identifier format.