Create, modify and inspect Matroska (MKV) files for Windows PC

MKVToolNix (64-bit)

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MKVToolNix 40.0.0 (64-bit)

  -  17.5 MB  -  Open Source
Free Download

Security Status

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of MKVToolNix 40.0.0 (64-bit).


For those interested in downloading the most recent release of MKVToolNix (64-bit) or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

Download MKVToolNix 40.0.0 (64-bit)

  • MKVToolNix 40.0.0 (64-bit) Screenshots

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    MKVToolNix 40.0.0 (64-bit) Screenshot 1
  • MKVToolNix 40.0.0 (64-bit) Screenshot 2
  • MKVToolNix 40.0.0 (64-bit) Screenshot 3

What's new in this version:

New features and enhancements:
- mkvmerge: MP4 reader: added support for BMP covert art images
- MKVToolNix GUI: multiplexer: added an option to disable deriving the destination file name from the file title
- MKVToolNix GUI: multiplexer: the content of the "stereoscopy" combo box has been simplified making the box's minimum width much smaller, allowing the user to resize the GUI's whole window to a much smaller width
- MKVToolNix GUI: multiplexer: whenever the user changes the "aspect ratio" or "display dimensions" controls, the corresponding radio button will be activated automatically
- MKVToolNix GUI: Windows: added a setting in the preferences to disable the GUI's dark color mode even if Windows's app color mode is set to dark
- MKVToolNix GUI: Windows: replaced the dark mode introduced in v39 with another dark mode that's less wasteful with space between widgets

Bug fixes:
- mkvmerge: MP4 reader: mkvmerge was reading eight bytes too many for cover art images. This could cause file identification to fail when the cover art was located at the end of the MP4 file. Even if it succeeded, this meant too much data present in the attachment
- mkvmerge: MP4 reader: covert art images with unknown image types will be skipped instead of treated as JPEG images

Build system changes:
- Qt 5.9.0 or newer is now required for building MKVToolNix GUI

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