Mac: There are plenty of file conversion utilities for the Mac, but Smart Converter is probably the easiest. Simply drag your file onto the window, select the destination device, and click convert. Smart Converter handles the rest.
The app will automatically convert your files to the format required for the destination device. If you’re not sure whether your file needs to be converted, or if you have a video where the audio needs conversion but the video does not, Smart Converter will do it.
The app relies on ffmpeg for audio and video conversions, but there’s something to be said for its simple interface and ease of use. How do you convert video when moving it to multiple devices? Share your tips in the comments.