Convert MP4 to MKV

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MP4 MKV

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Converting MP4 to MKV is free: drop your MP4 above, hit convert, and download the MKV. Files delete themselves within an hour.

Most MP4 to MKV conversions are wrapper swaps: the pictures stay pictures, they just trade MP4's box for one built for high-quality rips and archives with multiple audio and subtitle tracks. If the codec inside your MP4 is one MKV accepts, Flippy keeps quality bit-for-bit identical; if not, it re-encodes once, carefully, at matching quality.

Why flip MP4 to MKV

MP4 is the world's default video: the file that plays before anyone has to think about it. It was born in 2001, the MPEG standards group, built on Apple's QuickTime design, and its real weak spot is very little day to day: as a container its quality depends on the codec inside.

MKV is the format that hoards: video, a dozen audio tracks and every subtitle, all in one box. The Matroska container: it will hold practically any codec ever made. That makes it the right destination when what you need is high-quality rips and archives with multiple audio and subtitle tracks.

How to convert MP4 to MKV

  1. 1

    Drop your MP4 file into the flipper above, or click to browse for it.

  2. 2

    Check the output format: MKV is already selected for you.

  3. 3

    Hit Convert, give it a moment, then download your new MKV.

MP4 vs MKV, side by side

MP4 MKV
Born 2001, the MPEG standards group, built on Apple's QuickTime design 2002, the open-source Matroska project
Type video · container video · container
Best for playing everywhere: browsers, phones, TVs, editors, slide decks high-quality rips and archives with multiple audio and subtitle tracks
Weak spot very little day to day: as a container its quality depends on the codec inside playing on TVs, iPhones and editors that never learned to open the box
Typical size roughly 50–100 MB per minute at 1080p, depending on bitrate as big as whatever you put inside: movie files often run to several gigabytes
Plays on Every browser, phone, TV and editing app worth mentioning. VLC and desktop players love it; smart TVs, Apple devices and editors often don't.

Questions people ask

Will converting MP4 to MKV lose quality?

Usually not: when the video codec is compatible, Flippy swaps the container without re-encoding, so quality is untouched. If a re-encode is needed, it happens once at matching quality.

Will the MKV file be bigger or smaller than my MP4?

Similar, unless a re-encode is involved: then it depends on the codec. MKV typically runs as big as whatever you put inside: movie files often run to several gigabytes.

Where will the MKV file play?

VLC and desktop players love it; smart TVs, Apple devices and editors often don't. That's the usual reason people leave MP4 behind: MKV simply opens in more of the places that matter.

How long does MP4 to MKV conversion take?

When it's a pure container swap it's nearly instant, since nothing is re-encoded. Full re-encodes take roughly as long as the video plays, often less.

More ways to handle these formats

Change MP4 format Convert MKV Reduce MKV file size MKV Trimmer Slow down MKV MKV to GIF MP4 Rotator

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