When it comes to posting your portrait orientated images on Instagram, you are forced to confine your work into their 4:5 ratio. There are a few options including cropping, resizing your work, or using a third-party app to make it fit. Here's a unique solution that also includes optimal upload settings for Instagram.
If you are not looking to crop your work into the 4:5 ratio, your more common solutions are to add empty space on both sides either in Photoshop or in another app, or add some sort of pattern or photo behind it. In this video, photographer Dani Diamond shows his method of extending the image to transform his image into the 4:5 portrait orientation Instagram uses. This method will not work for every vertical shot, but if you have negative space around your subject, there's a good chance it will. You can also give content-aware extend a try, depending on your background.
To wrap up the video, Diamond shares his optimal image settings for sharing his work on Instagram. If you are still seeing issues of compression when posting your work, give these a try to see if it improves the quality.
Do you shoot with the 4:5 ratio in mind? If not, how do you handle Instagram's portrait ratio?