Conversion of pptx files to key file format

Keynote (previously part of iWorks) supports presentation formats from Microsoft PowerPoint, so you can simply import your .pptx files to Keynote and save it to one of its default file types, such as .key files. There doesn't seem any 3rd party software that could save in Keynote presentation format, so using the original program most likely remains your only viable option for pptx to key conversion.

Open PPTX file    Open KEY file

Related software

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Keynote for Mac

The most popular presentation software for Mac