I like to post small albums on instagram but the photos I want to group are often different aspect ratios. Usually I pick the photo I like the most and then add black bars at the top/bottom left/right of the other photos to match the aspect ratio of that photo. But this is tedious. Is there an app or a website that will do this for me? Alternatively if someone has a Lightroom/Photoshop workflow that would make this less tedious I would appreciate that too :)