Instagram is often thought to be an unfriendly social network when it comes to saving pictures from it on your computer (Mac/Windows). However, there is a very simple method that can be used to save any image from Instagram to your personal computer.
The first thing you need to do is visit Instagram.com from your web browser (Google Chrome/Safari) and log in using your username and password. You can also directly visit your account by typing www.instagram.com/username (example: Instagram) in your browser.
Once you have logged in browse through the gallery and pick the picture that you would like to download. Click on the picture to open it.
Once you open the picture, copy the link given in the browser.
Open www.savefromweb.com and paste the link into the bar given. Click on DOWNLOAD.
You will get a download option and your picture will be downloaded.
Repeat as much as you want as the service is free of charge.