Convert 3GP to MP4 Just using VLC player | Change Any Video 3gp to mp4 (easy method)

Why is that 3GP file so huge?
My edited a video and it was around 220 MB in mp4 file format whereas it was reduced to just 6-7mb in 3gp

0 bytes

is there a way i cam do more than one at once

Thank you so much for this!! Trying to save family videos

Thank you!