It often happens that your downloaded videos are not playable on PC or portable devices. What a frustrating situation! More often than not, this problem might imply that your playable device is not compatible with original video format, which reminds you to do some extra conversion with professional converting software. Hence, you will be more likely to search online for reliable software to convert MKV to MP4. It is somewhat an act of dredging for a needle in the sea. Any good solutions?
I recommend you to use a freeware called Format Factory, it supports MKV and other video/audio/image formats. Believe me, it's really 100% free and no ads. (link removed by moderator)
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
How to convert MKV files to MP4 in a fast, simple and free way?