SDR Free MKV to AVI Converter- 100% free, but fully functional. SDR Free MKV to AVI Converter does a great work of changing your video format while maintaining all of its quality. It is a small sized application and easy to use, so you can have a new AVI file in just a few minutes. SDR Free MKV to AVI Converter is not a universal converter, but it gives you fast performance. Just add or drag & drop your MKV video files to be converted to AVI formats and click Covert button. You can do presetting among Xvid FullScreen, Xvid WideScreen and MS compatible AVI.