How to Reduce MP3 Size in iTunes. Reducing the MP3 file size in iTunes provides a way to make your music files smaller. This becomes especially important when creating presentations. You don't ...

Converting MOV files to MP4 Converting to an MP4 file can drastically reduce file size without changing the audio or video quality in any way that is detectable to your audience.

On the other hand, lossy compression sacrifices some data to achieve higher reductions in size, commonly used in images, videos, and audio files.