Convert MKV to MP4 Online
Turn MKV files into MP4 directly in your browser using ConverterUp. There is no upload, no waiting in a queue, and no account required — your files stay on your device while WebAssembly does the work locally. Adjust quality and dimensions where supported, then download the result. The output keeps the visual fidelity you'd expect from a desktop app while running entirely in the browser tab.
Convert MKV to MP4 nowHow to convert MKV to MP4
Open the converter
Click the button to open the MKV to MP4 tool. It loads instantly — no install, no signup.
Drop your MKV file
Drag your MKV file into the upload area or click to browse. The file stays in your browser memory only.
Download MP4
The conversion runs locally and finishes in seconds. Click download to save the MP4 file to your device.
Frequently asked questions
Is the MKV to MP4 conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the MKV to MP4 converter. We support the project through unobtrusive ads.
Are my MKV files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The MKV bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For MKV input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
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Ready to convert MKV to MP4?
Open the tool, drop your file, and download the result. No upload, no signup, no watermarks.
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