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GENERATE NIL, V1, V4, AND V5 UUIDS AT ONCE

UUID Variants Generator

Generate a full set of UUID variants in one click — nil UUID, time-based v1, random v4, and name-based v5 — for comparing or testing against different UUID formats.

Click to generate one of each UUID variant — nil, v1 (time-based), v4 (random), and v5 (name-based).

Frequently asked questions

v1 is time-based (derived from a timestamp and network identifier — technically traceable to when/where it was generated). v4 is fully random, the most common choice for general-purpose unique IDs. v5 is name-based, deterministically generated from a namespace and name (the same input always produces the same UUID) — useful when you need a repeatable, unique identifier for a given value.

A UUID that's all zeros (00000000-0000-0000-0000-000000000000) — used as a well-known placeholder or sentinel value meaning "no UUID"/"unset".

Use our plain UUID Generator instead — it returns one v4 UUID per click without the other variants.

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