Move music from convert2mp3 to other device?

Is it legal for me to copy music I have downloaded with the converter from my laptop to my phone? Or do I have to download it again on the phone?

It is generally a gray-zone songs to download via Youtube converter - it does not matter if you do it on the phone or laptop / PC.

It is possible to copy already downloaded music to your mobile phone. All you need is a charging cable (if it's Android) and connect it to your phone and laptop. Then you just have to find the folder in which the music is stored on your phone and just pull the music from your PC. All this is done by explorer.