Tools/ULID Generator
Generators & IDs

ULID Generator

Generate ULIDs — identifiers that sort naturally by creation time while still being globally unique, unlike a standard UUID.

Free & unlimitedRuns in your browserNo sign-up required
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How it works

Three steps, no setup

1

Generate a ULID

A millisecond timestamp is combined with secure randomness.

2

Notice the sort order

Generate several in a row and see them sort chronologically as plain strings.

3

Copy into your schema

Great for primary keys where insertion order matters for indexing.

Common questions

Frequently asked questions

How is a ULID different from a UUID?
A ULID encodes a millisecond timestamp in its first 48 bits, so ULIDs generated later always sort after earlier ones — plain UUIDs sort randomly.
Is a ULID as unique as a UUID?
Yes, it still carries 80 bits of randomness alongside the timestamp, giving it a comparable collision resistance to UUID v4.
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