Convert MKV to MP4
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MKV (Matroska) is a flexible container popular for downloaded movies, rips, and anime releases because it can hold multiple audio tracks and subtitle streams — but plenty of phones, smart TVs, and web players simply refuse to open it. This tool repackages your MKV’s video and audio into a standard, widely compatible MP4.
Conversion runs fully in your browser using WebAssembly, so a file you would rather not upload — because of size, privacy, or just not wanting to wait on someone else’s server — never leaves your computer.
Also useful: Convert MOV to MP4 · Convert AVI to MP4
How it works
- Upload the MKV video file you want to convert to MP4.
- Wait while your browser decodes and re-encodes it into MP4 locally.
- Download your converted, widely compatible MP4 file.
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Frequently asked questions
Will subtitles or extra audio tracks carry over?
This tool outputs a straightforward MP4 with one video and one audio track for maximum compatibility. If your MKV has embedded subtitles or multiple audio tracks, those extras are not preserved in the MP4.
Does this tool upload my MKV file?
No. Everything happens locally through WebAssembly — there is no server involved, so it also works offline once the page and engine have loaded.
What size can I convert and does my browser matter?
Up to 300MB on desktop (100MB on mobile), with no duration limit. It runs on any modern browser with WebAssembly support — WebCodecs is not required here.