ULID Generator
Generate universally unique lexicographically sortable identifiers with millisecond precision and base32 encoding.
Run tool
The online ULID Generator creates time-ordered identifier strings suitable for database keys, distributed event tracking, and application logging. Each generated identifier contains 26 characters using a base32 alphabet. The value begins with a 10-character timestamp segment based on the current time in milliseconds, followed by a 16-character randomness segment derived from operating-system entropy.
You can generate a single identifier or request multiple items at once by specifying a quantity from 1 to 100. If you supply a number smaller than 1, the generator adjusts the quantity to 1. If you enter a number higher than 100, the generator caps the request at 100 entries.
When the generation completes, the interface displays the list of generated identifiers, the applied item count, an execution timestamp, and the first generated identifier as an immediate sample for quick copying. This format helps developers create sortable identifiers without complex local setup.
Instructions
- Enter the desired number of identifiers in the Count field, or leave it blank to generate 1 identifier.
- Run the generator to produce the output list.
- Copy the generated identifiers or use the sample identifier displayed in the output panel.
Examples
- Generating 1 default identifier: leaving the Count input empty produces a single 26-character string such as 01ARZ3NDEKTSV4RRFFQ69G5FAV alongside the generation timestamp.
- Batch generating 5 identifiers: setting the Count field to 5 produces a list of five distinct 26-character strings sorted chronologically by millisecond generation time.
FAQ
What is the structure of a generated ULID?
Each identifier is 26 characters long, composed of a 10-character timestamp segment representing milliseconds and a 16-character randomness segment encoded in Crockford base32.
How many identifiers can I create in a single request?
You can generate between 1 and 100 identifiers per run. Values outside this range automatically adjust to the closest valid bound.
What happens if I submit an invalid count?
Numbers below 1 are automatically set to 1, while numbers above 100 are capped at 100 before the identifiers are generated.