odt xls or .xlsx None. Google Sheets save documents in online servers so the exact file extension is not visible. ods What file extension does Google Sheets use for spreadsheet documents?5 points

Google Sheets uses the file extension.ods for spreadsheet documents. The.ods extension stands for OpenDocument Spreadsheet, which is a format used by Google Sheets and other spreadsheet applications that support the OpenDocument Format (ODF). This format is an open standard and is widely supported by various spreadsheet software, including Microsoft Excel, LibreOffice Calc, and Apple Numbers.