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At first, I pulled a photo into Photoshop, cropped it into 6 individual squares, saved each one out, then got them onto my phone. This seemed like way too much work and I knew there had be an easier way others were achieving this. Sure enough, I found a site that listed a few apps that actually do the work for you.
Pic Splitter
Available in the iTunes Store and Google Play for $1.99
Tile Pic
Available in the iTunes Store for free.
9 Square
Available for Android for free.
Each app enables you to split your photo into tiles to upload individually to Instagram for a large photo grid effect. I used Pic Splitter and it worked great, but if you try the others, I would love to hear your feedback! The post I found also recommended that after you’ve uploaded your grid, you will want to make future posts in groups of three to maintain the grid! Happy posting!