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Drop one KEY or two hundred. Batch conversion is not a paid feature here.
Convert KEY to PPTX
A Keynote deck has to be presented or edited by someone on Windows, where nothing will open a .key file.
SafeConvert engineFreeNo sign-upBatch supported
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
KEY and PPTX are not the same picture in two wrappers.
Slides, text, images and basic builds are mapped onto PowerPoint's object model, producing a PPTX that opens anywhere.
Worth knowing first
Keynote's signature features do not exist in PowerPoint. Magic Move has no equivalent and degrades to a plain transition, and decks built with Apple system fonts reflow when those fonts are missing, which moves text boxes off their intended positions.
Questions
KEY to PPTX, answered
Should the sender export instead?
Yes if they can. Keynote has File, Export To, PowerPoint built in, and it produces the best result. Conversion is for when the sender is not available.
What happens to the slide size?
It is preserved, so a 16:9 Keynote deck stays 16:9.
How to convert KEY to PPTX
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Choose your settings
PowerPoint Presentation is lossless, so nothing is thrown away in the conversion.
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Download
Converted and deleted the moment it finishes. Never written to permanent storage.