Convert PPT to PPTX online for free
1: Choose multiple local PPT files or enter the URL of an online PPT file. 2: Choose "PPTX" as target format and set options. 3: Click the "START CONVERSION" button to convert PPT files to PPTX online.
Set conversion options (optional)
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File extension: .ppt
Microsoft PowerPoint up until 2007 version used a proprietary binary file format called PowerPoint Binary File Format (.PPT) as its primary format. In Microsoft Office 2007 the binary file formats were replaced as the default format by the new XML based Office Open XML formats.
File extension: .pptx, .pptm
The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc.