Twitter Header Images are the large horizontal images that structure the top of every Twitter Profile. Used commonly as a space that can grab the attention of a visiting Twitter User, Twitter Header Images pair with the Twitter Profile Image to further curate an aesthetic, statement, or expression of the Twitter Profile. Twitter Header Images can be uploaded in JPG, PNG, or GIF formats. Animated GIFs are not supported.
Twitter Header Images have a 3:1 aspect ratio and are sized at 1500 x 500 pixels with a maximum file size of 5 MB.