shycut

Convert MKV to MP4 in your browser

MKV is a sturdy container to record into, but phones, TVs and many editing apps won’t take it. Drop the file here and get an MP4 that they will.

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Drop your video here

Choose your video

MP4, MOV, WebM or MKV. It opens right here, on your device.

  • Nothing uploaded
  • No sign-up
  • No watermark

Tested in the browser

BrowserResultWhat came out
Google Chrome 155ConvertedMP4: H.264 video, AAC sound, 1280×720
WebKit 27.2 (Safari’s engine)ConvertedMP4: H.264 video, AAC sound, 1280×720

On October 24, 2026, a 10-second 1280×720 MKV (H.264 video, AAC sound) went through this page’s button in each browser, and what came out was read back with ffprobe.

The test file carried a location tag; no converted copy kept it.

When to turn MKV into MP4

Screen recorders like to write MKV because a recording cut short by a crash or a full disk stays readable up to its last second. That safety stops paying off the moment you want to share it: many apps, sites and phones won’t open an MKV at all.

An MKV can carry several sound tracks and subtitles at once. The MP4 made here keeps the picture and the file’s main sound track; other sound tracks and subtitle tracks stay behind, so keep the MKV if you need them.

MKV and MP4, in short

MKV
Matroska, an open container that can hold several sound and subtitle tracks at once. Screen recorders and films use it; many phones, TVs and editing apps won’t open it.
MP4
The format that plays almost everywhere: phones, browsers, TVs, editing apps and every social platform take it. Inside is usually H.264 video and AAC sound.

How to convert

  1. Open the MKV

    Press the button and drop the file, or pick it from your files. It opens in this browser tab: nothing is uploaded, so there is no upload limit to hit.

  2. MP4 is already chosen

    The save window opens set to it. Change the file name or the quality if you like.

  3. Save

    The new file is written on your device and downloaded. Several files? Drop them together and they are converted one after another.

What changes, what stays

Picture and length
Nothing is cut or reframed: the video keeps its own picture size and runs from start to end.
Sound
The first sound track, at its own level, in stereo at most.
Quality
Small, Balanced or High; Balanced is chosen to begin with.
Details about you
The file is written from scratch, so none of the original’s metadata comes along: no location, no camera or phone model.

Questions

Which sound track is kept from an MKV with several?

Only one: the file’s main sound track. Shycut doesn’t let you pick another, and the rest are not carried into the MP4.

Do MKV subtitles carry over?

No, subtitle tracks are not copied. If you want captions, open the video in the editor instead: Shycut can write new ones from the speech, on your device.

Will the MP4 play on an iPhone?

The test table shows what went into the MP4 in each browser; H.264 video with AAC sound is the pairing iPhones play.

Your video stays with you.

Open Shycut, drop the video in and export. Free, with no account, and your video never leaves your device.

Choose your video

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