MKV to MP4— Free & Private
Convert MKV (Matroska) video files to MP4 format directly in your browser.
Drop an MKV file here or click to browse
MKV (Matroska) video files
All processing happens in your browser. No files are uploaded.
What Is MKV to MP4 Conversion?
MKV to MP4 is a free online tool that convert MKV (Matroska) video files to MP4 format directly in your browser. No files are uploaded — everything is processed locally on your device.
This MKV to MP4 converter online free repackages video from the Matroska (MKV) container into the MP4 container format. MKV is a flexible open-source container that can hold virtually any combination of video, audio, and subtitle tracks — it is the default format for Blu-ray rips, anime fansubs, and many media downloads. However, MKV has poor support on Apple devices, many smart TVs, and some social media platforms. MP4 (H.264 + AAC) is the universal standard. In many cases, the conversion can be done as a fast remux (repackaging without re-encoding) when the MKV already contains H.264 video and AAC audio. This converter runs entirely in your browser — no files are uploaded.
Privacy guarantee: MKV to MP4 processes all files directly in your browser using WebAssembly. No data is uploaded to any server, no information is collected, and the tool works offline after loading. Unlimited usage with no signup, no watermarks, and no file size limits.
How to Use MKV to MP4
Upload your MKV file
Select an MKV video file from your device or drag it into the converter.
Configure conversion settings
Choose video quality settings. If remuxing is possible, conversion will be near-instant.
Convert and download
Click Convert and download the MP4 file when processing completes.
Why Use Our MKV to MP4 Converter?
Frequently Asked Questions
What is the difference between MKV and MP4?
Both MKV and MP4 are container formats — they wrap video, audio, and subtitle streams. MKV (Matroska) supports virtually any codec and multiple tracks, making it popular for high-quality video. MP4 is more restrictive but universally supported by all devices, browsers, and platforms.
Can MKV to MP4 conversion be done without quality loss?
Yes, if the MKV file contains H.264 video and AAC audio, the converter can remux (repackage) the streams into an MP4 container without re-encoding, resulting in zero quality loss and very fast conversion.
Why won't my MKV file play on my iPhone or smart TV?
Apple devices and many smart TVs don't support the MKV container natively. Converting to MP4 solves this — the video and audio quality remain the same, but the container format becomes universally compatible.
What happens to subtitles when converting MKV to MP4?
MP4 has limited subtitle support compared to MKV. Embedded SRT/text subtitles can usually be preserved, but complex subtitle formats (ASS/SSA with styling) may need to be burned into the video or exported as a separate file.
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