MKVToolnix is a free tool for examining, inspecting and modifying the Matroska video file format.
Matroska is one of the most advanced Container Formats being able to support subtitles, multiple audio streams, DVD-like menus and more without for MKV files, no problem. The other big advantage of Matroska is that it also saves disk space and yet still offers relatively high image quality.
MKVToolnix is very easy to use. It can be used for displaying and adding audio tracks and subtitles or simply checking the integrity of a file just by browsing to it. Once you've browsed to a file, you can select which aspects you want to change or modify using the General Track Options, Format Specific Options or Extra Options depending on what you need. To change elements, you need to simply click the Start Muxing option.
If you use the MKV Matroska format regularly and need to modify files, then MKVToolnix is a simple and fast tool to help you.
