How is a ULID different from a UUID?

A ULID encodes a timestamp in its first part, making ULIDs naturally sortable by creation time — standard UUIDs (except certain newer variants) don't have this property.

Are ULIDs as globally unique as UUIDs?

Yes, the random portion provides comparable uniqueness guarantees to a UUID, while adding the sortability benefit.

Can I generate multiple ULIDs at once?

Yes, generate as many as you need — each will be unique and sortable relative to when it was generated.

Does ULID Generator upload my files to a server?

No. ULID Generator runs entirely in your browser using on-device processing, your files never leave your device.

ULID Generator

Generate sortable, timestamp-based ULIDs.

Runs in your browser

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About this tool

A ULID combines a timestamp with random bits into a single sortable identifier, solving a real limitation of both UUIDs (not naturally sortable by creation time) and auto-incrementing IDs (not safely generatable across distributed systems). This tool generates sortable, timestamp-based ULIDs, giving you an identifier that's both globally unique and naturally sorts by creation order.

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