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.

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

Converting MOV files to MP4 Converting to an MP4 file can drastically reduce file size without changing the audio or video quality in any way that is detectable to your audience.

WMV files may have great quality, but they're not as versatile as MP4. Our guide shows you how to convert WMV files to MP4.

When it comes to converting file extensions on your iPhone, don't worry about downloading a third-party app when you can make the changes yourself.