Twitter includes a feature that allows you to download an image if it is set as your profile photo or header. Here’s how it’s done: 1. Go to “Settings and Privacy” and select the tab called “Customize Profile.” 2. All the photographs from your account will be viewable at the bottom of the page under “Profile Picture.” If you click on any of these, you can replace it with another picture from Twitter. 3. If you select “Save Changes,” a copy of the picture in PNG format will be saved to your computer’s hard drive.