The most important thing to know is that the higher the bitrate, the better sound quality you get. 320kbps sounds better than 256kbps, which in turn sounds better than 128kbps. When you choose a bitrate for your audio files, you should generally go with 256kbps or higher. It's pretty clear that 320 kbps is the standard we should be aiming for. Rest assured that you are not losing on the quality of Audio after converting them from Youtube. Go-Mp3 converts the Youtube video into the best possible quality of MP3. The Audio is encoded in 320 kbps at 16 bits.