1
Upload MP42
Review File3
Convert to MKV4
Download MKV1
Upload MP4Choose the MP4 file you want to convert.
2
Review File
3
Convert to MKV
4
Download MKV
video Converter• 100% Client-Side
MP4 to MKV Converter
Remux MP4 video into Matroska MKV container.
mp4→mkv
Drop MP4 file(s) here, or browse
Supports single or multiple batch conversion
Private by Design
Your files are processed directly on your device using WebAssembly, HTML5 Canvas, and client-side runtimes.
No server upload No cloud copy 100% local processing
How To Convert
How to Convert MP4 to MKV
Step 1
Upload MP4
Choose the MP4 file you want to convert.
Step 2
Review File
Check the file information and conversion options.
Step 3
Convert to MKV
Start the local MP4 to MKV conversion.
Step 4
Download MKV
Download your converted MKV file.
Frequently Asked Questions
Questions about MP4 to MKV Conversion
Does remuxing re-encode video?
Streams are packaged efficiently into the MKV container with high fidelity.
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