UUID Generator
Generate v4 (purely random) or v7 (time-ordered, monotonic) UUIDs. Bulk generation up to 1000 at once.
v4 vs v7 — when to use which
v4: 122 bits of randomness. Standard for "I just need a unique ID." 5.3×10³⁶ unique values — collision practically impossible.
v7 (RFC 9562, 2024): first 48 bits are a Unix millisecond timestamp, then 74 bits of randomness. Sortable by creation time, which matters for database B-tree indexes (random UUIDs cause page splits; v7s don't). Use v7 for primary keys in new systems.