Zoho Sheet - Online Excel Viewer Navigate to Zoho Sheet, the free online Excel viewer (see Resources). Click the "Browse" button in the Local File section, select the XLS file and click "Open." ...

You can also open and edit XLSX files without Excel, completely free, using WPS Office Spreadsheets, OpenOffice Calc, or LibreOffice Calc. If you're on a Mac, Apple Numbers supports XLSX files ...