in Audio & Multimedia / Rippers & Converters User Rating: 3.2 (10 votes) Currently 3.20/512345 MacX Free MKV Video Converter is a 100% free MKV converter for Mac to convert MKV for free on Mac OS. It supports converting MKV to any video formats, including MKV to MP4, AVI, MOV, FLV, H.264, etc.