For the best way to convert MKV files into MP4 format without losing quality I suggest using Softaken Audio Video Converter Software. I’ve tried several converters before but many of them reduce the video quality or take a long time. With this tool the process is quick and it keeps the original resolution intact. You just load your MKV file, choose MP4 as the output format and hit the button. The software is easy for novices and it includes batch conversion which saves a lot of time with multiple files. Your original audio and video syncing is always perfect with this application so you can be assured of flawless playback on all devices.
 
If you want to convert MKV to MP4 without losing quality, and reserving the original video parameters. The key reason is to find a tool with full support for new codecs. VLC or FFmpeg will do the job. Though they generally involve fiddling around with bitrate, resolution and codec settings if not at best quality loss and worst case playback problems.

A better solution is turning to a specialized tool such as SysTools Video Converter. Like the others, it can convert MKV to MP4 with no original resolution, frame rate and quality loss. The application is capable of dealing with advanced codecs such as H.264, H.265 (HEVC), AV1, and VP9 and has zero re-encoding quality loss. This is particularly handy if you have large or high resolution MKV files (HD/4K).

It has an easy-to-use interface, supports batch conversion and requires no technical knowledge to get high quality output. If you're looking to preserve quality then this technique is quick and error-free.
 
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