For me, file conversion has always been a big problem. I use it very often because I have to work with many different formats every day. Most of the time, I work with WAV. It is the audio format that best conveys the originality of the sound. But WAV weighs a lot compared to regular MP3. Because of that, I have to convert wav to mp3 to save some space on my hard disk. This problem has been haunting me for a year and a half now, and if you only knew how tired I am. The only good thing is that the conversion does not take much time, thanks to the developers of such sites for that.