How to convert PPTX to PDF. 1 First, select and upload your PPT or PPTX files into the converter area. 2 Then click the "Convert" button and wait for the conversion to complete. 3 Now your PDF files are ready. You can download them individually or in a single ZIP archive. Convert your Powerpoint spreadsheets to PDF. Convert your Powerpoint to PDF online, easily and free. · The Microsoft Outlook plugin enables you to convert emails, attachments, and entire email folders to PDF, as well as archive important files for quick reference. Convert multiple PDFs at once Instead of painstakingly converting one document at a time, use Nitro Pro to convert entire collections of PDFs into editable Microsoft Office or image files in a single step.