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 ...

Learn how to merge multiple CSV files into one Excel sheet. You can combine or join more than one CSV file into one Excel Worksheet.

If the file has a .csv file extension, another program such as Microsoft Excel might open and display the file. If Windows displays a pop-up window named "Open With," proceed to the next step.

CSVFileView is a free portable tool that lets you open CSV files and manage data without using Excel or Google Sheets on Windows 11/10.