A free photography app recommend to
you:
Instagrid Grids for Instagram is
a very simple app which can crop any of your pictures into 3x1, 3x2, 3x3, 3x4,
3x5 grids and post images directly to Instagram. It will help you
gain more Instagram followers and attention by having the best looking grids
on Instagram.
It’s easy to use, with it you can
create high resolution grids from your personal pictures and that will impress
all your Instagram followers, it’s cool.
Download
Instagrid Grids for Instagram APK (fast download speed with only 3.6MB and
it can be saved to SDCard)