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ULID Generator

Generate ULIDs online — lexicographically sortable, time-ordered unique identifiers, in your browser.

About this tool

Generate ULIDs: 26-character identifiers that encode a timestamp first, so they sort in creation order while staying globally unique. A friendly alternative to UUIDs for database keys.

Frequently asked questions

Why use a ULID over a UUID?

ULIDs are time-sortable and URL-safe (Crockford Base32), so recent records cluster together and indexes stay tidy — handy for logs and event stores.

Are ULIDs unique?

Yes: 48 bits of millisecond timestamp plus 80 bits of randomness make collisions within the same millisecond astronomically unlikely.

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