The Exact twitter header dimensions 2016. This is what you need to do to get your twitter header image with perfect dimensions. First, you have to understand that there will be a border for twitters header image. The border will be outlined in black below.
The dimensions for this image: 1500px (width) X 421px (height)
To download right click the image above and hit save! This is a .PNG image.
The inside of the twitter photo that you need to edit is: 1263px (width) X 333px (height) roughly. If you are using an image editor you can download this overlay to set on top of the image above after you edit your photo.
The white rectangle is best left blank or matching your background when you edit, do not put words or anything important in the white!
To get a perfect Twitter header just edit the above picture and place it in the white area on the first photo. Then simply upload it to twitter.
Here is an example of what your photo should look like after you edit.
A great place to edit your photos online is Pixlr.