Figure 1: How your twitter header will look like in your profile
Figure 2: The top and bottom portion of the header will be cut off
Twitter will replace the top and bottom portion of your header image with the white border seen in Figure 1. Thus, the ideal Twitter header dimensions would be 1500 x 421 px. This size would allow you to comfortably design your header without worrying about any parts getting cut off. (Figure 2)
The last thing to remember is the area where your profile picture would be. Avoid having images/text in that area as it would be covered by your profile photo.
Twitter Header file size
Not to exceed 5MB
Can i add a Gif as my Twitter Header?
No. Twitter does not support animated Gifs as your header.
1. Use a high resolution image
2. Place important elements in the centre
3. Change your header regularly
Besides uploading just standard headers for Twitter, many people have recently started to use a white header — making its popularity skyrocket.
Minimalistic in design, white Twitter headers blend in perfectly with Twitter’s light mode and give off a serene and aesthetically-pleasing vibe.
Generally, people use small graphic overlays, coupled with things like text messages and white background as their Twitter header image.
Nike uses its header to strengthen branding by including just the iconic tagline
Notice how Krispy Kreme’s main text is placed nicely in the centre
Samsung takes the opportunity to showcase its upcoming product
The Six Flags Theme Park header conveys all the right emotions: Fun, Thrill, Adrenaline
Domino’s Pizza chooses a tantalizing image to appeal to our taste buds
NBC Entertainment uses its header to tell a story about its logo design over the years
ABC uses its header to show support towards pride month in June