Both .key and .keynote files are used for presentations made using Keynote app from OS X, however each come from different version of the software. It should be still possible to save newer .key files to older .keynotes, but you will need to tweak the program preferences and set it to KEYNOTE format instead KEY.
Convert iWork Keynote '09 presentation to iWork Keynote '06 presentation.
We found 2 software records in the database related to .key to .keynote file format conversion.
Apple macOS / Mac OS X software - convert key to keynote on OS X
The most popular presentation software for Mac
Convert from key file format
|Yes, Keynote for Mac supports keynote file conversion as a target file type.||Yes||Yes||keynote editor||Yes||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned key to keynote. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple iOS (iPhone, iPad, iPod Touch devices) software - convert key to keynote on iOS
Presentation software for iOS operating system, developed by Apple.