What software can convert mp3 to m4a on win7

[becbazin]

I am using win7, can someone recommend me software that can convert mp3 to m4a.
M4a is the format for iphone, I want to install ringtones for my phone, my phone is not unlocked

 

[TrainableMan]

Easiest thing to do is run a search for "convert mp3 to m4a".

I even found one that was online, no software installation needed, here:
https://online-audio-converter.com/