convert-csv.com logo convert-csv.com

Generate Test Data to CSV / Excel / JSON

Build realistic mock datasets (names, emails, dates, numbers) and export to CSV, Excel, or JSON.

100% Secure - your files are processed in your browser and never sent to a server.

Mock Data Generator

Design columns and build sample files in your browser.

How to use the Generate Test Data tool

  1. Design your schema: Add columns by specifying a column name and selecting a data type: id, uuid, name, email, phone, address, company, date, or number.
  2. Configure fields: For number and date types, set min and max values to control the generated range.
  3. Set row count: Enter how many rows of mock data you want to generate.
  4. Generate data: Click the "Generate Mock Data" button to create a realistic dataset.
  5. Export results: Copy the generated data to your clipboard or download it as a CSV file.

Frequently asked questions

Is it safe to use Generate Test Data with sensitive or confidential data?
Yes, completely. All processing done by Generate Test Data runs 100% client-side inside your local web browser using a background Web Worker thread. Your data is never uploaded, transmitted, or stored on any server, not even temporarily.
What is the maximum file size Generate Test Data can handle?
Generate Test Data supports files up to 100 MB. Because all parsing happens inside your browser's memory rather than on a server, performance scales with your computer's available RAM. The Web Worker architecture keeps the UI fully responsive even during heavy processing.
How does Generate Test Data process my data without uploading it?
Generate Test Data uses modern browser File and Blob APIs alongside battle-tested open-source libraries (such as PapaParse and SheetJS) bundled directly into the page. When you load a file or paste data, the browser reads it into local memory and the conversion runs entirely inside a sandboxed Web Worker thread. No network call is ever made.
Do I need to install anything to use Generate Test Data?
No installation, browser extension, or plugin is required. Generate Test Data runs as a standard web page inside any modern browser. Simply open it, load your data, and download the output. Nothing to install and nothing to uninstall.
Does Generate Test Data work offline after the page has loaded?
Yes. Once Generate Test Data has finished loading in your browser, the conversion engine itself requires no active internet connection. You can disconnect from the network and continue converting files; all processing stays fully on-device.

Related tools