A version-1 UUID encodes a 60-bit timestamp (100-nanosecond intervals since 1582) plus a clock sequence and a node identifier. Because the timestamp is embedded, v1 UUIDs are roughly ordered by creation time.

Does this expose my MAC address?

No. The classic v1 spec uses the network card's MAC for the node field, but browsers cannot read it. This tool generates a random node with the multicast bit set, so no hardware identity ever leaves your machine.

Is anything uploaded?

No — the timestamp, random node, and clock sequence are all computed in your browser and nothing is uploaded.

UUID v1 Generator — Gera Tools

Time-based UUID v1 generator

A UUID v1 packs a timestamp, a clock sequence, and a node identifier into a 128-bit value defined by RFC 4122. The embedded timestamp means v1 UUIDs are roughly ordered by when they were created, which can be useful for debugging or loosely time-sortable keys.

Traditionally the node field held the machine’s MAC address. Browsers can’t read hardware addresses, so this tool fills it with a random node (multicast bit set) instead — you get a spec-compliant v1 UUID with zero hardware leakage. Everything runs entirely in your browser, nothing is uploaded.