Question: app to do split pictures?
Answer: PhotoSplit is the most popular app to split your photos to the grid and post them directly to Instagram. PhotoSplit lets you slice any photo into a 1x2, 1x3, 2x3, 3x3 & 4x3 grid while keeping it in high resolution. It then quickly lets you post the split images to Instagram to show it as one big photo on your profile.