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How To Split MKV files using MKVToolnix

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In this tutorial we will look at how to split a large .mkv file in to multiple parts and in a user specified size. This will keep them in the same container without any loss in quality of audio or video. For this we will require a free program written by the very talented  Moritz Bunkus called  MKVToolnix


. Once you have downloaded (I chose the installer, but the .7zip is there if you prefer) the program which for Windows users can be found at the bottom of the page, install it.

First select your language


Click Next


Select the install path, by default it will be C:\


Now click Install


You will now be asked if you wish to add a shortcut for the program on your Desktop


In the next window, you will be asked if you wish to use a GUI (graphical user interface) for mkvextract. For the purposes of this tutorial, we are just splitting a .mkv file, and a GUI is included for this purpose. Click Next


That’s the install finished. Next we will move on to the main window.


When the program first opens, you will be greeted with the main window, with the Input tab selected. Click add and navigate to the mkv file that you wish to split. Highlight the file and hit Open.


The file information will now be loaded. At the bottom you can also specify the path for the outputted files. I chose to keep then in the same folder, which is what it will default to.


Next click on the Global tab, and check the Enable Splitting box. Just under this, make sure that …after this size: is selected and input the size of the largest split file that you require. Now for me, I wanted to enable the mkv to be played on a FAT32 file system, so it will have to be less than 4GB. I chose 3800M (MB) as my preferred split file size, but note that they may come out slightly larger so avoid choosing 3950M as that may run over the 4GB mark, which is what you want to avoid. Please note that you have to specify a size identifying letter after the numerical size:

G = Gigabyte (G)
M = Megabyte (M)
K = Kilobyte (K)

Once you have selected your split file size, simply click Start Muxing at the bottom.


The program is very quick to work, but this will vary depending on your hardware specs.


Hopefully, you should have now successfully split your mkv file into separate files that will play in FAT32 file systems or for whatever reason you wanted to split them.



As you can see from the output folder, my 11.5GB.mkv file has now been split into 3 separate files. The video and audio quality is just as crisp, and the splits are spot on


Please note, that in this tutorial I was running Windows 7 Ultimate x64 with 4GB RAM on an Intel Core 2 Quad Q6600.

MKVToolnix is available on the following platforms:

Mac OS X


Well, I hope this has been of use to some of you. This program is simply fantastic and very quick, and has a ton of other features which I haven’t gone into, so have a play around. Any questions, please feel free to ask in the comments.

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Many thanks for this , was getting in a mess trying to do it using time codes.This was easy. Brain dead moment. lol.

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