.key files are presentations, created with Apple's presentation software Keynote, which is part of the iWork package. Keynote is availabe for Mac OS X and iOS and is a competitor to Microsoft Powerpoint. .key files can contain slides with pictures, charts, transitions and videos.
PPTX is a presentation file format that that is associated with Microsoft Office. It supports Microsoft PowerPoint 2007 and its later versions. It can contain text, presentations, data and any kind of multimedia files. It uses zip mechanism and XML to compress the data, charts, diagrams, media files etc.
+200 Formats Supported
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