Free for Windows 10 and 11 · works offline
Convert MKV to MP4 on Windows
MP4 plays on almost everything: phones, TVs, editors and websites. S Converter turns MKV files into MP4, using your graphics card to go faster.
How to do it with S Converter
- Open S Converter and choose Video in the sidebar.
- Drag in your MKV files.
- Under Format, pick MP4. Leave Resolution on Original, or choose 1080p or 720p for smaller files.
- Press Convert.
Or skip the app with Quick Convert
- Select your MKV videos in File Explorer.
- Press Ctrl + Alt + C. A wheel opens at your mouse.
- Click MP4. The converted files appear next to the originals.
The shortcut works while S Converter is running (it waits in the system tray). In the version from GitHub you can also right-click files and choose S Converter; on Windows 11 it's under Show more options.
Why S Converter
Uses your graphics card
NVIDIA, Intel and AMD are detected automatically, falling back to the processor when needed.
Trim while you’re there
Cut the start and end on a visual timeline.
Many formats
Also MOV, AVI, WebM, WMV and more, in either direction.
Questions
Does it keep subtitles?
MP4 supports fewer subtitle types than MKV, so some subtitle tracks may not carry over.
Why is it faster on some PCs?
With a supported graphics card S Converter encodes on the GPU, which is much faster than the processor alone.
Related guides
Get S Converter
Free, no ads, no account. Images, video, audio, documents, PDFs and archives, all converted on your own PC.