Japanese Personal Data Generator

Generate up to 3,000 rows of Japanese-style personal information for development or QA. Choose the fields you need-names, addresses, My Number IDs-and download them as CSV, TSV, or JSON.

Adjust the format, record count, and generation logic, then click "Generate test data." Your settings are saved in the browser and restored automatically next time.

Basic settings
Population distribution

Set the female percentage between 0 and 100%. If unset, a 50/50 split is used.

ID settings
Fields to generate

Check the fields you need. Unchecked items are omitted.

Names

Basic info

Contact

Work & identification

Preview

Not generated yet

Shows the first 10 rows using the latest settings. Download to review the full dataset.

Download

Buttons become active after generation. CSV/TSV files include a UTF-8 BOM.

Highlights

  • Loads nationwide surname, given-name, and address lists from JSON with lazy loading.
  • Calculates check digits for My Number IDs and credit card numbers to generate non-existent values.
  • Saves the latest settings to localStorage so you can regenerate with the same options later.