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Generate UUID v4 identifiers one or hundreds at a time, with format options: uppercase, strip hyphens, or wrap in braces — matching whatever your database, API, or legacy system expects.
UUIDs are generated with your browser's cryptographic random source, giving you the same quality of uniqueness as any server-side generator. Nothing is transmitted, so generated identifiers for unreleased features stay private.
Version 4 UUIDs carry 122 random bits. The chance of two matching is astronomically small — you could generate billions per year for millennia without a collision. That is why they are the standard for distributed systems that cannot coordinate through a central counter.
UUIDs let independent systems mint IDs without coordination and avoid leaking record counts (the 5th customer should not see /users/5). Auto-increment is smaller and faster to index. A common compromise: auto-increment internally, UUID externally.
This tool generates v4 (random). If you need time-sortable IDs (v7/ULID) for database locality, that is a different generator — v4 remains the safe universal default.
PureKit · uuid · Free online tool — files processed locally in your browser, no upload.