Convert MKV to MP4

Turn MKV files into MP4 videos that play on phones, TVs and editors — often in seconds, without re-encoding. Everything runs in your browser, so nothing is uploaded.

Drop your files here

or drag and drop · MKV · up to 1 GB

    Working…

    First use downloads the conversion engine (≈ 10 MB). It is then cached by your browser.

    Done!

      Continue with

      Processed on your device. Nothing is uploaded. · Free · No sign-up · No watermark

      How to convert MKV to MP4

      1. 1

        Click Choose files or drop one or more .mkv files into the box.

      2. 2

        Click Convert. The fastest method is picked automatically for each file.

      3. 3

        Each MP4 downloads when it's ready; for several files use Download all (ZIP).

      MKV vs MP4

      Both are containers — boxes that hold video, audio and other tracks. MKV (Matroska) is extremely flexible: it can carry many audio languages, several subtitle formats, chapters and almost any codec. That’s why it’s popular with screen recorders like OBS, video archiving and media servers. MP4 is less flexible, but it’s what phones, TVs, browsers, social networks and editing apps expect.

      MKVMP4
      Multiple audio and subtitle tracksYes, many formatsLimited
      Plays on iPhone, smart TVs, editorsOften notYes
      Typical codecsH.264, H.265, VP9, AAC, AC3, Opus…H.264, H.265, AAC

      Repackaging vs re-encoding

      TurboConvert looks inside your MKV first:

      • Compatible streams (most commonly H.264 video with AAC audio) are copied into an MP4 container as they are. This is called remuxing: it’s fast, and the picture and sound are bit-for-bit identical.
      • Incompatible streams are re-encoded to H.264 video and AAC audio, which takes much longer but produces an MP4 that plays everywhere.

      Recorded with OBS?

      OBS Studio records to MKV by default so a crash doesn’t corrupt the whole recording. It also has a built-in Remux Recordings option. If you don’t have OBS at hand — or you’re on another computer — drop the MKV here for the same result.

      Common problems

      • The MP4 has no subtitles. Subtitle tracks may not survive the conversion. Use a player that reads MKV directly if you need them.
      • The wrong audio language was kept. When an MKV has several audio tracks, only one is kept in the MP4, chosen automatically. If it’s not the one you want, keep watching the MKV in a player that supports track selection, such as VLC.
      • The file is over 1 GB. Very long, high-bitrate MKVs exceed the limit; cut them into parts with a desktop tool or use the original in a player that supports MKV.

      Tips

      No upload, no watermark and no account: your video stays on your device from start to finish.

      Questions & answers

      Does converting MKV to MP4 lose quality?
      Usually not. Most MKV files contain H.264 video and AAC or similar audio, which can be moved into an MP4 container as they are — no re-encoding, no quality loss. Otherwise the video is re-encoded to H.264/AAC at a high quality setting.
      Why won't my MKV play on my TV or iPhone?
      MKV is a flexible container that many TVs, iPhones, consoles and editors don't support. MP4 is accepted almost everywhere, so converting usually fixes playback.
      Are subtitles kept?
      Not reliably. MP4 supports far fewer subtitle formats than MKV, so subtitle tracks may be dropped. Keep the MKV if you need them.
      How long does it take?
      When the streams can be copied, a few seconds to a minute even for a long video. When re-encoding is needed, roughly as long as the video or more, depending on your device.
      Is my file uploaded?
      No. The conversion runs in your browser with FFmpeg, so the file never leaves your device.
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