UUID v7 Generator & Decoder — RFC 9562 Time-Ordered IDs

Standard UUID Version 4 identifiers are generated from purely random bits. While excellent for collisions, their lack of ordering wreaks havoc on database performance: inserting random UUIDv4 keys into B-Tree indexes (like in PostgreSQL, MySQL InnoDB, or SQL Server) leads to severe index fragmentation, high page split rates, and degraded cache locality. In 2024, the IETF officially published RFC 9562, establishing UUID Version 7 as the modern standard for distributed systems.

UUIDv7 solves index fragmentation by embedding a 48-bit millisecond Unix timestamp at the front of the identifier, followed by version bits, sub-millisecond sequence bits, and cryptographically secure randomness. This ensures UUIDv7 values are naturally monotonic and chronologically sortable while preserving complete decentralization.

UtilDash's UUID v7 Studio provides both bulk generation (from 1 to 100 IDs at a time) and a deep Inspection Decoder. Paste any existing UUIDv7 to instantly extract its exact creation timestamp (in both UTC ISO 8601 and local time), determine its relative age, and visualize its bit breakdown into timestamp, version, and sequence segments.