there's not much to say but, i'll be sharing the apps and sizes I use for covers.
apps:
• picsart
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• phonto
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• ibisPaint X
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• vsco
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sizes:
• cover: 1024 x 1600 • banner : 1000 x 1000
for the cover size, i know most people say 512 x 800, but i find that this cover size gives a better quality photo. it's basically double the 512 x 800 size, so it will still fit.
for the banner, it really just needs to be a square on the phone, so a one to one ratio. i'm not sure about the size for it on tablets or laptops though.