Convert AVI to MKV etc- wIth NO Loss! free - fast - offline - no sign-up - It's DoofProof. SWEET! 

avidemux is a no nonsense, bloat-free easy to use converter that DOESN'T shrink down your video. It just swaps the "container". (MP4, MKV, MOV etc).
It's free- you can use it offline and takes seconds to process a whole movie and it looks just as good as the original. Finally,..

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