MKV is a popular video format which containes a huge number of different video, audio and subtitles in a single file.However, MKV cannot be played on Apple's mobile devices like iPhone4S. As we know, iPhone4S only supports MP4, MOV and M4V. So if you want to watch MKV videos on iPhone4S, you need to convert MKV to iPhone4S compatible video format first. Now in the followin post, you will get how to convert MKV to iPhone4S on Mac, with the help of Leawo MKV to iPhone4S Converter for Mac--a professional and easy-to-use video converter for Mac.
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1-Add MKV files to Mac MKV to iPhone4S Converter
Run Mac MKV converter, and load source files into it. Three ways are offered for you to add: direct drag and drop; click 
in the middle of the application; click “File” in top menu to add video folder.
2-Basic video editing
Some MKV files have multiple subtitles and soundtrack, pick one among them. 
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If you would like to edit your source video before conversion, check “Edit” in top menu to do “Media Edit”. Five basic video editing features are provided: trim , crop, rotation, effect and watermark.
3-Select profile for iPhone4S
Click the button before 3D to pick profile. Choose “iPhone 4 HD” from Apple tab. Or customize the profile by clicking the plus sign. Some video and audio parameters are free to adjust: video codec, video size, quality, frame rate, bit rate…
4-Convert MKV to iPhone4S on Mac
Hit 
to start MKV to iPhone 4S conversion on Mac OS. When the conversion is done, upload the output videos to your iPhone 4S and enjoy it any time you like!
