WonderFox HD Video Converter Factory Pro is the converter program we'd like to share with you to convert .aac to .ac3 with ease. It is a multifunctional video & audio converter that can deal with various types of video and audio-related issues, including changing audio format in a video. With simple clicks, you can convert AAC audio track to AC3 fast without video quality loss. Now, free downloadfree download the software and see how to convert AAC to AC3 below.