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Convert MP4 to MKV

Counter MP4 → MKV
Drop your files here .mp4 .m4v

    Turn MP4 files into MKV in seconds. MKV is a flexible container that plays happily in VLC and media servers.

    • Free
    • No sign-up
    • Batch conversion

    Why convert MP4 to MKV?

    To convert MP4 files to MKV, drop them on the counter above.

    Most files convert in seconds: no queue, no email address, and the MKV result saves straight to your computer or phone.

    How to convert MP4 to MKV

    1. Add your MP4 files

      Drag your MP4 files onto the counter or pick them with Choose files. You can add several at once.

    2. Check the settings

      The defaults suit most cases. Change quality, size or other options if you like; after a change, one click converts again.

    3. Conversion starts by itself

      Each file is converted to MKV and its row is stamped CONVERTED.

    4. Download your MKV file

      Get the file with Download. With several files you can download them all as one ZIP.

    MP4 vs MKV

    PropertyMP4MKV
    Full nameMPEG-4 Part 14Matroska Video
    TypeVideoVideo
    CompressionLossyDepends on codec
    Created byMPEG (ISO/IEC 14496-14)Matroska
    Year20012002
    Extensions.mp4 .m4v.mkv
    MIMEvideo/mp4video/x-matroska

    About the formats

    MP4

    MPEG-4 Part 14

    MP4 is the most common video format in the world. It usually carries H.264 video and AAC audio and plays smoothly on phones, browsers, TVs and social networks.

    All MP4 conversions

    MKV

    Matroska Video

    MKV (Matroska) is a flexible video container that can hold several audio tracks, subtitles and chapters in one file. It is common in film collections and OBS recordings.

    All MKV conversions

    Frequently asked questions

    Is converting MP4 to MKV free?

    Yes, completely free. No account, no daily limit, no watermark and no queue.

    Does it work on a phone?

    Yes. It works on iPhone, iPad and Android, with no app to install.

    Is there a file size limit?

    There is no size limit set by us. Files of hundreds of MB convert too; very large files take longer and are handled more comfortably on a computer than on a phone.

    Other conversions
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    MP4 M4A sound only, better than MP3 at the same size
    MP4 AVI works with old players
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    FLV MKV multiple audio and subtitles · Flash-era video