The iPhone 5S isn’t expected to differentiate itself from the iPhone 5 too drastically, though a better camera and slightly faster processor will surely be part of the package. It’s been reported that the iPhone 5S would have a Retina+ Sharp IGZO display, which would have a 1080p Full HD resolution. This would be a vast improvement over the 727,040 pixels found in the current iPhone 5 Retina display, which stands at 640 x 1,136 resolution and 326 pixels per inch.

However, according to the iPhone 5S supported video formats, it supports only videos in limited formats: MP4,M4V and H.264. For MKV videos, iPhone 5S will not open and read directly. Some guys suggest installing a media player app for iPhone 5S, but it’s a pity like the popular video player MXplayer still can’t handle all of the media files. Here fast and easy solution is to convert MKV to iPhone 5S compatible format via a third-party software. We highly recommend UFUWare HD Video Converter, which can convert MKV videos to other mobile devices like iPhone 6/6 Plus, iPad Air 2, Sony Xperia Z2, Xperia Z3, Samsung Galaxy S5, Samsung Galaxy Note 3, Surface Pro 3, BlackBerry and many more for watching.

How to convert MKV videos to iPhone 5S supported format?

Free download and install UFUWare HD Video Converter:

Free Download HD Video Converter for Mac Free Download HD Video Converter

Step 1. Install the top converter, and click the “Add Video” button to add your video files like MKV, AVI, VOB, Tivo, WMV, MTS, MXF, MOV, TOD, MOD, 3GP, FLV, F4V, M4V, etc. to the MKV to iPhone 5S Converter.

iPhone 5S Video Converter

Step 2. Click “Profile” bar, you can easily find the optimized videos for iPhone 5S:“HD > HD H.264/MPEG-4 AVC Video(*.mp4)”. The output videos could fit on the Apple iPhone 5S perfectly.

Convert videos to iPhone 5S supported video format

Step 3. You can click “Settings” to change the video encoder, frame rate, resolution, etc. Remember the file size and video quality is based more on bitrate than resolution which means bitrate higher results in big file size, and lower visible quality loss. According to my experience, for watching movies on the iPhone 5S, 1920 x 1080 with 1500kbps~2000kbps is just all right.

Adjust video and audio parameters

Step 4. Click the “Convert” button to convert MKV videos to iPhone 5S supported MP4 or HD MP4 format.

After the conersion completed, click “Open Folder” button to get the generated .mp4 files, and transfer them to iPhone 5S. Just enjoy it!

Tip: If you want to play Blu-ray movies on iPhone 5S, you can rip Blu-ray movies to iPhone 5S supported format MP4.