MKV to MP4 Converter
Matroska video to MP4 container.
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Click or drag and drop a .mkv file here
Ctrl+Enter
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Frequently Asked Questions
What is an MKV file? +
MKV (Matroska Video) is an open-source container format that can hold multiple video, audio, and subtitle tracks in a single file. It is popular for high-quality video but is not supported by all players and devices.
Does converting MKV to MP4 reduce quality? +
The video is re-encoded using H.264 and AAC codecs, so there is minor quality loss from transcoding. For most purposes the difference is imperceptible. The output uses faststart for optimized streaming.
Will subtitle tracks be preserved? +
Subtitle tracks in the MKV are not carried over to the MP4 output. If you need subtitles, consider burning them into the video with a desktop tool before or after conversion.
How long does the conversion take? +
It depends on file size and your device speed. A 100MB file typically takes 30-90 seconds. The WASM engine runs on your CPU, so faster processors finish sooner.
Why does the engine take a while to load? +
The video engine (FFmpeg compiled to WebAssembly) is about 24MB. It downloads once when you first click Convert, then stays cached by your browser for future visits.
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