MKVToolNix is the free open-source toolkit for rebuilding MKV files, letting you merge, split, retag and extract tracks without re-encoding, because it rewrites only the container and leaves the video and audio streams untouched.

MKVToolNix screenshots

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How to Download MKVToolNix

1 Click the DOWNLOAD button for your preferred link (US/EU Main or Mirror). When prompted by your browser, choose "Save" and select a destination folder.
2 We recommend using the mirror links (EU MIRROR / US MIRROR) first - they tend to be faster and more reliable than external sources.
3 Having trouble downloading MKVToolNix? If the download doesn't start, click the link again or try a different browser (Firefox/Chrome). Some security software may block downloads due to false positives.