v1 — Time-based (MAC or node + timestamp). Implemented via the uuid library's v1 function.

v3 — Name-based (MD5) using a namespace + name. Implemented via uuid.v3; enter a Name and Namespace to generate.

v4 — Random. Implemented via uuid.v4 (cryptographically-random bytes).

v5 — Name-based (SHA-1) using a namespace + name. Implemented via uuid.v5; enter a Name and Namespace to generate.

v6 — Draft time-ordered variant. This tool provides a best-effort fallback by encoding the timestamp into the high bytes and marking the version nibble as 6.

v7 — Draft timestamp-then-random UUID. Implemented by writing the 48-bit millisecond timestamp into bytes 0..5, filling remaining bytes with secure randomness, then setting version/variant bits.

v8 — Experimental/custom: this tool generates a random 128-bit payload and sets the version nibble to 8 (application-defined semantics).

Note: v6–v8 are draft/experimental; browser implementations vary. This tool implements v7/v8 locally using Web Crypto and a v6 best-effort fallback without changing project build targets.