How do I convert MP4 to Matroska (MKV)?

Upload your MP4 file using the box above, confirm Matroska (MKV) as the output format, then select Convert. The converted file is ready to download as soon as processing finishes — usually in a few seconds.

Is converting MP4 to MKV free?

Yes, and there is nothing to sign up for. Every conversion is free, there is no paid tier, and the limits are the same for everyone.

Will the quality change when converting to Matroska (MKV)?

MKV uses lossy compression, so some data is discarded to keep the file small. The default quality setting is tuned to be visually or audibly transparent for most material, and you can raise it in the conversion settings.

What happens to my file afterwards?

The uploaded file is deleted as soon as the conversion completes, and the converted file is removed automatically once its retention window ends. Download links are signed and expire within minutes.

mp4mkv

Convert MP4 to Matroska (MKV)

Free online converter for MP4 files. Flexible container for high-quality video. Nothing to install, no watermark, and every file is deleted automatically.

Drag and drop your files

Upload a MP4 file to convert it to Matroska (MKV). Up to 200 files at once, 10 GB each.

Free · up to 200 files · 10 GB each · files deleted automatically after 168 hours.

About MP4 and MKV

MP4

H.264/AAC video that plays on virtually any device.

video/mp4

Matroska (MKV)

Flexible container for high-quality video.

video/x-matroska

Other MP4 conversions

mp4 to webm
mp4 to mov
mp4 to avi
mp4 to gif
mp4 to mp3
mp4 to wav
mp4 to flac
mp4 to ogg

Other ways to get Matroska (MKV)

webm to mkv
mov to mkv
avi to mkv