How to Open Multiple CSV Files in One Excel Spreadsheet. The CSV file extension appears on text documents that contain comma-separated values. Like spreadsheet data, each line in a CSV file ...

Once you enter and submit, it starts downloading the .csv file automatically. Considering everything, it is better to use the second method if you already have the browser extension.

Sign into your newsletter service or open your email application. Export a your subscriber list to file using the CSV file extension. For example, in Gmail, click the "Gmail" drop-down menu, and ...