Most recent media found on the web is released in MKV (high definition). You can play them using a Media player like VLC, or QuickTime with Perian plugin. However, if you want to add MKV to iTunes library, you'll disappointed since iTunes natively doesn't support the MKV format. iTunes supports only H.264 encoded MOV, MP4 and M4V. That means in order to import MKV to iTunes, you need to convert MKV to iTunes supported video formats for syncing across multiple Apple devices easily.
To get the work done, Here EaseFab Video Converter Ultimate is recommended as the most appropriate tool to convert MKV files to iTunes MP4, MOV or M4V fast yet with high output video quality. What's more, if you want to play MKV, WMV, AVI, VOB, MPG, TiVo, etc. video on your iPad, iPhone, iPod, you can directly select the device model as the output format. No manual video settings are required. All Apple devices are supported, including iPad Pro, iPad Air, iPad mini, iPad with Retina display, iPhone XS Max, etc. The equivalent Mac version is EaseFab Video Converter Ultimate for Mac (macOS Mojave compatible). Now just download the right program and follow the step-by-step guide to encode MKV to iTunes-friendly format.
Download the MKV to iTunes converter:
How to convert and add MKV files to iTunes library
For Windows (including Windows 10 included) users, just follow the detailed guide to complete your conversion. The way to add MKV movies to iTunes on Mac (including macOS Mojave) is the same. Just make sure you've downloaded the right version.
Step 1: Import MKV video files
Open the program and drag your MKV video files from your computer to the program. You can also click the Add Video button to load your source media files.
If you want to convert multiple MKV videos to a single file for iTunes, simply click the "Edit" menu to choose the "Merge Into One File" to combine all the added video files into one.
Step 2: Select iTunes format and output folder
After you have successfully completed loading your MKV files, select the output format and folder. If you do not have a ready folder, create one where you can easily locate it. The video formats available are M4V, MP4 or MOV. In this case, we shall select MP4 format (Profile > Common Video > MP4 Video) from the common video choices only for description purposes.
If you want to sync the converted video to a specific devices like iPhone, iPad, iPod or other devices, you can choose your device model from Apple category.
Step 3: Converting MKV to iTunes
Click the "Convert" button to initiate the conversion. The resulted videos will be smaller in file size, leaving more free space for your other multimedia contents.
Step 4: Import video to iTunes library
Now the converted MKV video is ready to be imported into iTunes and if necessary, sync with your Apple device. To import videos to iTunes, open iTunes and go to File > Add to Library or directly drag and drop the converted video to iTunes. And then find the video in the Movies category.
To sync the converted video to your device, first connect your device to your computer. Then find your device in the iTunes' sidebar. In the Summary tab, click Sync at bottom to sync iTunes content to your device.