ULID Generator Online — Create Sortable Unique IDs

Generate a ULID online with a timestamp prefix and browser-random suffix, locally without an upload.

About this tool

This ULID generator combines the current millisecond timestamp with Crockford Base32 characters derived from browser random bytes. The result is a compact, time-sortable identifier.

How to use

  1. Click Generate to use the current time.
  2. Copy the 26-character ULID.
  3. Generate a separate value for each record or event.

Features

  • Creates 26-character Crockford Base32 identifiers.
  • Includes a sortable timestamp prefix.
  • Uses browser cryptographic randomness for the suffix.

Common use cases

  • Create sortable database record IDs.
  • Label distributed events and logs.
  • Generate test fixtures with time ordering.

Common issues and tips

  • The timestamp portion reveals approximate creation time.
  • Uniqueness still depends on using a fresh generated value for every item.

Privacy

ULID generation runs locally in your browser. Generated IDs are not uploaded to Tools12345.

Frequently asked questions

How is a ULID different from UUID?

ULID uses a time-based prefix and Base32 text, making values naturally sortable by creation time.

How long is a ULID?

A standard textual ULID is 26 characters.

Does it expose creation time?

Yes. The leading portion encodes the generation timestamp.

Related tools

UUID Generator →Token Generator →Timestamp Converter →