The new look is widely available now; just login and Twitter will give you an overview and the option to update immediately. Here’s what you need to know:
400×400 pixels. Image is automatically resized to ﬁt.
1500×500 pixels. Image is automatically resized to ﬁt and is cropped to a 2:1 aspect ratio on mobile.
Up to 160 characters. Your bio is displayed on your proﬁle header under your name and username.
Click on the “more” option on the Tweet you want to pin and select “Pin to your proﬁle page.”
Photo and player Cards appear directly on your proﬁle, and Vines automatically play.
Your Best Tweets
The Tweets that get people talking are now bigger in size.