Convert MP4 to MKV
Convert MP4 to MKV online for free. Simply drop your MP4 files below to convert them to MKV in seconds.
- Free Converter
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- No Uploads
Add files
Drop files anywhere on the page or paste them with Ctrl+V / ⌘+V
How to convert MP4 to MKV?
Add MP4 files
Drag and drop files onto the page or click the upload area. You can add several files at once.
Choose MKV and settings
Pick the target format and, if needed, adjust quality, size and other options.
Download the result
Conversion runs right in your browser. Download files one by one or all at once as a ZIP archive.
Converting MP4 to MKV: what to know
MP4 is converted to MKV for a media library and players like Kodi and Plex, and for further work in programs that combine several audio tracks and subtitles in one file.
MKV accepts almost any codec, so the video and audio from the MP4 are usually copied without re-encoding: fast, with no quality loss and the same file size.
MP4 or MKV: which to choose?
MP4 (MPEG-4 Part 14)
MP4 is the most compatible video format: it plays on phones, TVs, browsers and social networks.
Best for publishing and sending videos - maximum compatibility at a reasonable size.
MKV (Matroska Video)
MKV is a flexible container that holds any codecs, several audio tracks and subtitles.
Best for films and series with several audio tracks and subtitles.
What happens when converting MP4 to MKV
If the codecs inside MP4 are supported by MKV, the tracks are copied without re-encoding - quickly and without quality loss. Otherwise the video is re-encoded with the codec, bitrate, resolution and frame rate you choose.
You can also trim the video, rotate or flip it and remove the sound.
MP4 files up to 2 GB are supported; the actual limit also depends on the free memory of your device.
MP4 and MKV compared
Convert MP4 to other formats
Convert other formats to MKV
What else you can do with MP4
Frequently asked questions
How do I convert MP4 to MKV?
Add MP4 files above - MKV is already selected as the target format. Adjust the settings if needed, start the conversion and download the MKV files.
Can I change the MKV quality?
Yes. Set the quality from 1 to 100 in the file settings: the lower the value, the smaller the file.