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Convert MKV to OPUS

Extract the audio from MKV videos and save it as OPUS — ideal for voice messages, calls and streaming at low bitrates.

  • No upload — 100% private
  • Fast, lossless when possible
  • Free & unlimited
  • Works on iPhone & Android

    Quality
    Advanced options
    Trim (optional)
    Use minutes:seconds, e.g. 1:05.5

    How to convert MKV to OPUS

    1. 1

      Tap Choose files and select one or more MKV files (or drag them in).

    2. 2

      Check that OPUS is selected. Use Advanced options for bitrate, channels or trimming.

    3. 3

      Press Convert. Everything happens on your device — no upload, no waiting in a queue.

    4. 4

      Your OPUS downloads automatically. Converting several files? Grab them all as a ZIP.

    MKV vs OPUS

    Only the sound is kept — the picture is dropped, so the OPUS file is far smaller than the MKV video.

    MKVOPUS
    Full nameMatroska VideoOpus Audio
    TypeVideoAudio
    CompressionLossyLossy
    Developed byMatroska.orgIETF / Xiph.Org
    Introduced20022012
    Plays on iPhone✕ No◐ Partly / with an app
    Plays on Android◐ Partly / with an app✓ Yes
    Plays on Windows✓ Yes✓ Yes
    Plays on Mac◐ Partly / with an app✓ Yes

    About MKV and OPUS

    MKV: MKV is a flexible open container that can hold unlimited video, audio and subtitle tracks. It is popular for movies and anime but isn't supported by iPhone or most TVs out of the box.

    OPUS: Opus is a modern, highly efficient codec used by WhatsApp voice notes, Discord, Zoom and WebRTC calls. It sounds excellent even at very low bitrates.

    Frequently asked questions

    How do I convert MKV to OPUS on my phone?
    Open this page in your phone's browser (Safari, Chrome, Samsung Internet), tap Choose files, pick your MKV, make sure OPUS is selected and tap Convert. The OPUS file is saved to your Downloads.
    Will converting MKV to OPUS reduce quality?
    Only the sound is kept — the picture is dropped, so the OPUS file is far smaller than the MKV video.
    Can I convert only part of the MKV?
    Yes. Open Advanced options → Trim and enter a start and end time.
    Is this MKV to OPUS converter free?
    Yes — completely free with no limits on the number of files, no watermark and no account. The site is supported by ads.
    Are my files uploaded to a server?
    No. The converter runs inside your browser using WebAssembly, so your files never leave your device. That's also why it works for private and confidential recordings.

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    Convert MKV to other formats

    MKV to MP4MKV to MOVMKV to WEBMMKV to AVIMKV to FLVMKV to WMVMKV to 3GPMKV to M4VMKV to MPGMKV to TSMKV to GIFMKV to MP3MKV to M4AMKV to M4RMKV to AACMKV to ALACMKV to WAVMKV to FLACMKV to OGGMKV to WEBAMKV to WMAMKV to AIFFMKV to AC3MKV to CAF

    Convert other formats to OPUS

    MP3 to OPUSM4A to OPUSM4R to OPUSAAC to OPUSALAC to OPUSWAV to OPUSFLAC to OPUSOGG to OPUSWEBA to OPUSWMA to OPUSAIFF to OPUSAC3 to OPUSCAF to OPUSAMR to OPUS3GA to OPUSAPE to OPUSMP4 to OPUSMOV to OPUSWEBM to OPUSAVI to OPUSFLV to OPUSWMV to OPUS3GP to OPUSM4V to OPUSMPG to OPUSTS to OPUSGIF to OPUSMTS to OPUSVOB to OPUSHEVC to OPUSRMVB to OPUS

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