An open-source tool. Simply drag your AVI file in, select the "Web Optimized" preset, and convert it to MP4. This often reduces file size while maintaining (or slightly improving) the perceived quality through de-combing filters. 4. Advanced Playback with Modern Codecs

Sometimes a video looks bad simply because your computer is using an old codec to read it.

The AVI container is outdated. It doesn’t support modern compression efficiently. Converting your file to will make it compatible with iPhones, Smart TVs, and tablets.