iWork Keynote still supports the previously used KEYNOTE format and you can re-save these presentations to KEY format with it. Probably no other way to do it as both formats are exclusive to iWork Keynote.
Convert iWork Keynote '06 presentation to iWork Keynote '09 presentation.
We found 2 software records in the database related to .keynote to .key file format conversion.
Apple macOS / Mac OS X software - convert keynote to key on OS X
The most popular presentation software for Mac
Convert from keynote file format
|Yes, Keynote for Mac supports keynote file conversion as a source 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 keynote to key. 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 keynote to key on iOS
Presentation software for iOS operating system, developed by Apple.