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ULID Generator

Generate sortable unique ULID identifiers.

Input data is processed in your browser
Data is never sent to a server

Tool

What is a ULID?

ULID (Universally Unique Lexicographically Sortable Identifier) is a unique identifier that can be sorted lexicographically.

It represents 128 bits of information as a 26-character Base32 string. When used as a database primary key, ULIDs offer performance advantages because indexes are naturally ordered according to the time of generation.

How to Use

  1. Click the "Generate" button to create a ULID.
  2. Specify the number of IDs to generate multiple ULIDs at once.
  3. Click an individual ID or use "Copy All" to copy them to the clipboard.

FAQ

What is the difference between a ULID and a UUID?

UUIDs are primarily random, whereas ULIDs include a timestamp component, allowing them to be sorted in the order they were generated.

Is there a possibility of collisions (duplicate IDs)?

Theoretically, collisions are possible, but ULIDs are designed to avoid collisions unless approximately 1.21e+24 IDs are generated within the same millisecond. In practice, uniqueness is effectively guaranteed.

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