Version 7 UUID Generator

A time-ordered UUID — a Unix-millisecond timestamp followed by random bits.

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About Version 7

A version 7 UUID starts with a 48-bit Unix-millisecond timestamp and fills the rest with random data. Because the leading bits increase over time, v7 values sort by creation time, which makes them far friendlier than v4 as database primary keys (better index locality) while staying collision-resistant.

Generate a UUID in code

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Other UUID versions

Version 4 UUID Generator A random 128-bit identifier — the safe default for database keys and request IDs. Version 1 UUID Generator A time-based UUID built from a timestamp, clock sequence and node. Nil UUID Generator The all-zero UUID — a placeholder meaning “no value”. GUID Generator A GUID is the same 128-bit value, shown in the classic uppercase braces format.

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