Another option is to resize your photos instazoom on another platform like Facebook or Twitter before posting them on Instagram. You can then post them to Instagram with a new profile picture that is the correct size.

You can also manually resize your photos on Instagram by going to the crop menu. This is the best way to ensure your pictures look great on Instagram.

There are also a number of apps that can automatically change your photos for you. You can download these apps on your phone and upload them to Instagram to ensure your photos look the way they are meant to look.

The app you use should allow you to adjust the width and height of the image, as well as the aspect ratio, and this will prevent Instagram from enlarging your photos. It will also prevent resizing from cropping parts of your photos which can make them look pixelated.