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UUID v7 Generator

Generate time-ordered UUID v7 identifiers that index cleanly.

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Quick Tool Overview

The UUID v7 Generator produces standard UUIDs whose leading 48 bits are a millisecond timestamp, so they sort by creation time and behave far better as database keys than version 4.

What it does
Generates time-ordered UUID v7 identifiers
You give it
A quantity, and optionally a timestamp
You get back
Sortable UUIDs with their decoded times
Best for
Primary keys that do not fragment an index
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About the UUID v7 Generator

UUID version 7 puts a 48-bit millisecond timestamp at the front and fills the rest with randomness. It is a normal UUID in every respect — same length, same format, same column type — but it sorts by creation time, which changes how it behaves as a primary key.

That difference is not small. A v4 primary key lands at a random point in a B-tree index on every insert, which fragments pages and destroys cache locality; a v7 key appends, like an auto-increment integer, while still being safe to generate anywhere without coordination. It has been standardised in RFC 9562, so libraries are widespread. Generated ids are shown with their decoded timestamp so you can confirm the ordering is real.

Key features of the UUID v7 Generator

Time-ordered

Inserts append to the end of an index instead of landing at random points, which on a large table is the difference between a fast insert and a slow one.

A drop-in for v4

Same 128 bits, same format, same column type — only the version nibble differs, so no schema change is needed.

Timestamps shown

Each generated id is displayed with its decoded creation time, so the ordering is visible rather than asserted.

Custom timestamps

Generate ids for a specific moment, for seeding fixtures that need to sort in a particular order.

RFC 9562 conformant

The version and variant bits are set as the standard requires, so any library reads them back correctly.

How to use the UUID v7 Generator

  1. 1

    Generate

    One or many; each carries the millisecond it was created.

  2. 2

    Check the ordering

    Bulk output is in ascending order, because the timestamp leads the value.

  3. 3

    Set a custom time

    Generate ids for a specific moment, which is useful for seeding historical fixtures.

  4. 4

    Copy or download

    Take them to your clipboard or save them as a text file.

Frequently asked questions

Because it is time-ordered. A random key inserts at a random point in the index, fragmenting it; a time-ordered key appends. On a large table that is the difference between a fast insert and a slow one.

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