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Convert MKV to WEBM

Counter MKV → WEBM
Drop your files here .mkv

    iPhones, social networks and some TVs do not accept MKV. WebM is an open, royalty-free video format optimised for the web.

    • Free
    • No sign-up
    • Batch conversion

    Why convert MKV to WEBM?

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

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

    How to convert MKV to WEBM

    1. Add your MKV files

      Drag your MKV 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 WEBM and its row is stamped CONVERTED.

    4. Download your WEBM file

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

    MKV vs WEBM

    PropertyMKVWEBM
    Full nameMatroska VideoWebM
    TypeVideoVideo
    CompressionDepends on codecLossy
    Created byMatroskaGoogle
    Year20022010
    Extensions.mkv.webm
    MIMEvideo/x-matroskavideo/webm

    About the formats

    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

    WEBM

    WebM

    WebM is the open video format Google built for the web. It carries VP9 or AV1 video with Opus audio, and screen recordings and videos recorded in the browser are often WebM.

    All WEBM conversions

    Frequently asked questions

    Is converting MKV to WEBM 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
    Family Give → Get What you gain
    WEBM MKV multiple audio and subtitles
    MKV MP4 plays everywhere
    MKV MP3 sound only, plays on every device
    MKV MOV Apple and video editors
    MKV AVI works with old players
    MKV GIF silent loop
    MKV WAV sound only, lossless, ready to edit
    MKV M4A sound only, better than MP3 at the same size
    MP4 WEBM light video for the web · phone video
    GIF WEBM much smaller animation
    MOV WEBM light video for the web · iPhone video
    AVI WEBM light video for the web · old camcorder footage
    WMV WEBM light video for the web · Movie Maker video
    FLV WEBM light video for the web · Flash-era video