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UUID v7 Generator
RFC 9562 time-ordered UUIDs, generated in your browser. The 48-bit millisecond timestamp comes first, so every batch sorts by creation time.
Generate a batch
Values are produced on load with the defaults, so you always start with a usable list.
How it works
UUID v7 packs a 48-bit Unix millisecond timestamp into the first 6 bytes, then a 12-bit counter and 62 random bits from the browser's crypto generator, so values in one batch are strictly increasing. The timestamp is your device's local clock, so a machine with a wrong clock still produces valid RFC 9562 values — just not historically truthful ones.
Any integer 1–1000. Garbage input falls back to 10, and the field always shows the value actually used.
48-bit millisecond timestamp, version nibble 7, a per-millisecond monotonic counter, variant bits 10 and 62 random bits — crypto.getRandomValues only.
Click one line, Copy all, or save the batch as .txt. Toggling case or hyphens re-formats the same values without regenerating them.
Why UUID v7
The timestamp leads, so lexicographic order equals creation order — handy for keys, logs and seeded fixtures.
Sequential inserts append to a B-tree instead of scattering random pages the way v4 keys do.
Version nibble 7 and variant bits 10 — the same layout your database or library will validate.
No sign-up, no upload, no network round-trip: the batch is assembled in this tab in milliseconds.
FAQ
What is a UUID v7?
A 128-bit identifier defined by RFC 9562 whose first 48 bits are a Unix millisecond timestamp, followed by a version nibble of 7 and a 12-bit counter, then 62 random bits behind the 10 variant bits. Because time leads the value, v7 UUIDs sort in creation order.
UUID v4 vs v7?
Both are 128 bits and unique in practice. v4 is fully random, so it carries no time information and inserts scatter across an index; v7 keeps the timestamp up front, so it is unique, sortable and gentler on database pages. Prefer v7 for primary keys, v4 when you want zero metadata in the value.
Are these real RFC 9562 UUIDs?
Yes. Every value here is assembled with the exact bit layout — version nibble 7, variant bits 10, 48-bit millisecond timestamp — and each batch is verified in the page with a shape and ordering self-check. Randomness comes only from window.crypto.getRandomValues.
Where does the timestamp come from?
Your device's clock via Date.now(). The tool never contacts a server, so an offline or misconfigured machine still yields valid v7 UUIDs, just anchored to the local time it believes in.