You can convert files to the MP4 format on the VLC media player, making them more accessible across your devices.

I'm going crazy trying to find a way to convert a .mkv file with H264/AAC to an .mp4 file with the same content (so QT can play it natively). VLC's transcoding doesn't work, ffmpeg doesn't seem to ...

We outline three simple methods for converting MKVs into the easier-to-play MP4 format, and help you decide which is best for you.

For example, you could have a device that can only play MP4 videos, and not MKV. To be able to watch your MKV file, you have to know how to convert MKV to MP4 file format.

Regardless of which online service you choose from the ones featured in our guide, we'll show you how to convert MKV to MP4 video files.