ULID generator & inspector

Generate random ULIDs at a selected timestamp or inspect the 48-bit timestamp encoded in an existing ULID.

01 Input

YOUR INPUT

02 Output

LOCAL RESULT

QUICK GUIDE / 39

How to use

Select Load example to restore the sample, or replace the labeled inputs with your own values.
Review the options and select Run tool. No input is sent to a server.
A ULID contains 48 timestamp bits and 80 random bits encoded in Crockford Base32. Generation uses your device’s cryptographic random source. Inspect uses only the ULID input. Generate uses only the timestamp and count fields; the ULID input is ignored.
Inspect the result, then copy or download it. Clear removes visible inputs and output.

A worked example

Load example restores these values.

Operation:
Inspect

ULID to inspect:
00000000000000000000000000

Generation timestamp (ISO with timezone):
2026-10-22T00:00:00Z

Number to generate:
3

Expected result

Timestamp (ms): 0
UTC: 1970-01-01T00:00:00.000Z

Scope & limitations

Random, non-monotonic generation: IDs created in the same millisecond are not guaranteed to sort by creation order. Maximum 100 per run. Inspection validates alphabet and overflow but cannot prove uniqueness or provenance; ambiguous I/L/O/U characters are rejected.

Preparing offline tools…Everything runs on your device.

ULID generator & inspector

01 Input

02 Output

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