Photo Grid is a free image editor that lets you create collages with your favorite photos and resize the image to Instagram.
Functions:
Creates collages; lets you move, rotate, zoom and flip images; offers several design templates, borders and background images; lets you share collages on Facebook, Instagram, Twitter, Flickr, Picasa, Blogger and Tumblrand.
How to use:
By accessing the menu, the user accesses the options to edit and save in JPEG and PNG formats; to create collages simply shake the device or select one of the models offered.