Hi Anila-21,

You may try below steps for converting an Excel file to a PDF:

1. Create any server-side script, for eg, a business rule or ui action on the source table where the attachment is attached and use below script: 

 try {
     // Find the most recent attachment on the current record
     var grAttach = new GlideRecord('sys_attachment');
     grAttach.addQuery('table_sys_id', current.sys_id + '');
     grAttach.addQuery('file_name', 'ENDSWITH', '.xlsx').addOrCondition('file_name', 'ENDSWITH', '.xls');
     grAttach.orderByDesc('sys_created_on');
     grAttach.query();

     while (grAttach.next()) {

         // Use GlideExcelParser to read the attachment data
         var parser = new sn_impex.GlideExcelParser();
         var attachment = new GlideSysAttachment();
         var attachmentStream = attachment.getContentStream(grAttach.sys_id);

         parser.parse(attachmentStream);

         // Build the HTML string
         var htmlContent = '<table border="1" style="border-collapse: collapse; width: 100%;">';
         var headers = parser.getColumnHeaders();

         // Add table headers
         htmlContent += '<tr style="background-color: #f2f2f2;">';
         for (var i = 0; i < headers.length; i++) {
             htmlContent += '<th style="padding: 8px;">' + headers[i] + '</th>';
         }
         htmlContent += '</tr>';

         // Add table rows with data
         while (parser.next()) {
             var row = parser.getRow();
             htmlContent += '<tr>';
             for (var j = 0; j < headers.length; j++) {
                 var cellValue = row[headers[j]] || '';
                 htmlContent += '<td style="padding: 8px;">' + cellValue + '</td>';
             }
             htmlContent += '</tr>';
         }
         htmlContent += '</table>';

         // Generate the PDF from the HTML field
         var pdfName = (grAttach.file_name.toString().indexOf('.xlsx')) ? grAttach.file_name.toString().replace(/\.xlsx?$/, '') + '.pdf' : grAttach.file_name.toString().replace(/\.xls?$/, '') + '.pdf';
         var pdfApi = new sn_pdfgeneratorutils.PDFGenerationAPI();
         pdfApi.convertToPDF(htmlContent, current.getTableName(), current.sys_id, pdfName);

     }
     action.setRedirectURL(current);
 } catch (e) {
     gs.error('Excel to PDF Error: ' + e.message + ' At line: ' + e.lineNumber);
 }

I hope this helps anyone in need of any requirement of converting Excel attachment to PDF.

Please like and mark helpful if it helps.

Best Regards,

Amish Ranjan