When enlarging images in Instagram, you need to know what the image-aspect ratio is. Instagram automatically uploads photos when they are published, so you need to keep that in mind when changing your images. A square image has an aspect ratio of about 1:1 - so you'll need to resize it. That's why you want to make sure you upload an image that's at least 1080 pixels wide.
If your image is too big for SQUARE FORMAT APP format, you can crop it with photo editing tool. Then upload the image to the Instagram app and it will resize without adding white borders. It's a simple process that only requires three steps. With this app you can mark specific areas of your image that you don't want to be cropped with so that its size should be offset without compromising quality.
