UUID Generator
Generate random UUID v4 instantly. Bulk mode, multiple formats, one-click copy. 100% client-side.
Privacy:UUIDs are generated using your browser's crypto.randomUUID() API. No data is sent to any server.
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Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically unique across all devices and time. UUID v4 uses random numbers, making collisions astronomically unlikely.
Is UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's term for the same concept. UUID and GUID are interchangeable.
Why does this require HTTPS?
This tool uses crypto.randomUUID(), a browser API that requires a secure context (HTTPS) to guarantee cryptographically strong random numbers.
What is the difference between UUID v4 and v7?
UUID v4 is fully random. UUID v7 embeds a timestamp, making it sortable by creation time — useful for database primary keys where insertion order matters.