WinX HD Video Converter Deluxe is the best GPU-accelerated 4K/HD video converter for Windows 11/10. It can convert any 4K/HD video to MP4, MOV, AVI, MP3, and iPhone or Android, resize large videos for faster uploading, trim/crop/merge video clips to create new stories and download 4K/HD videos to MP4 MP3 flawlessly. With unique GPU acceleration tech and High Quality Engine, it can convert video at 47X real-time fast speed with intact quality.

Key Features:
1) Convert 4K HD/SD videos from/to over 200 formats, like MKV to MP4, MKV to AVI, M2TS, HEVC/H.265, H.264, MOV, M4V, MPEG4, AVI, FLV, WMV, MP3, AAC, etc.
2) With 420+ preset profiles, transfer any video to iPhone, iPad, iPod, Apple TV, Android Samsung, Huawei, Sony, Surface, and more devices for watching anytime.
3) Compress large video size by up to 90% for easy storage and faster uploading.
4) Save online video and music from 1000+ video sites and convert to MP4/MP3 for offline playback.
5) Edit, cut, crop, merge videos, add subtitles and adjust parameters, etc.
6) Make photos into slideshow video with music for sharing with friends.

How to Convert 4K MKV to MP4 with High Quality?
Step 1, Import video into this MKV converter by clicking the '+ video' button.
Step 2, Select the output profile. You can choose converting MKV to MP4, MKV to iPhone, MOV to MP4 and more upon your personal demand.
Step 3, Press 'RUN' to start the conversion.

How to download Facebook/Dailymotion/Yahoo, etc video with Fast Speed?
Step 1, Copy the video link from Facebook/Dailymotion/Yahoo and then paste it into this 4K/HD video downloader via the 'RUL' pop-up window.
Step 2, Click 'Analyze'. It will auto detect all the information, such as resolution, format, size and code.
Step 3, Select your desired one and click 'ok'.