UUID v7 Generator

UUID v7 is a modern alternative to UUID v1 and v4, designed specifically for database use. It combines Unix millisecond timestamps with random data, creating IDs that are both chronologically sortable and unpredictable. This makes UUID v7 ideal for modern applications where you want the best of both worlds: sequential ordering for database performance and randomness for security.

Modern timestamp design

UUID v7 uses Unix milliseconds (the timestamp 格式化 most developers know) in its most-significant bits, followed by random data. This design is simpler than UUID v1's complex timestamp encoding and provides millisecond-precision timestamps you can easily 解码. Unlike random UUID v4, identifiers sort in chronological order—the ID 生成d at 3:00 PM sorts before one 生成d at 3:01 PM.

Database-friendly ordering

Random UUID v4 identifiers scatter data across database indexes unpredictably, which can reduce insertion performance and cache efficiency. UUID v7's chronological ordering means inserts append to the end of indexes, which is much faster. For databases handling millions of records, this performance difference is significant. Many modern databases now recommend or prefer UUID v7 for this reason.

Timestamp extraction

Like UUID v1, UUID v7 timestamps can be extracted from the UUID itself. This tool 解码s each UUID to show when it was 生成d, useful for auditing and debugging. The timestamp is in Unix milliseconds, the standard 格式化 used throughout modern web development.

Randomness preserved

The remaining 62 bits of UUID v7 are random, providing excellent uniqueness. UUIDs 生成d in the same millisecond still differ; only their ordering is predictable. This balance makes UUID v7 suitable for both performance-critical databases and security-sensitive applications.

Adoption and compatibility

UUID v7 is newer (RFC 9562) and not yet universal, but adoption is growing rapidly. PostgreSQL 13+ supports it natively, and many ORMs and frameworks now default to UUID v7. For new projects, UUID v7 is often the best choice.