Twitch Profile Setup
The profile picture and profile banner are two of the most prominent features of your profile. Whether it’s a favorite picture of yours or dedicated branding that you want to use, these images will be one of the first impressions you make on viewers.
There are few ways how you can edit your profile channel art
To add or change your channel art first login on Twitch and click on your profile icon on the right side at the top and select Settings from the dropdown menu.
On the Settings page, you can add your profile image and you can add your profile banner.
Notice that Profile Picture
Must be JPEG, PNG, or GIF and cannot exceed 10MB.
File format: JPEG, PNG, GIF (recommended 1200×480, max 10MB)
Twitch recommends 1200×480 but with testing the best resolution and size we offer 1920×480 profile banners that will perfectly match the visible area and your channel art
Blue areas represent visible parts on your profile banner, you should focus on adding logo/brand assets on sides and your social names or important information on top or bottom of the profile banner.
You can also change your profile banner and other settings by going to Channel Settings or you can click on your icon on the right side at the top and select Settings from the dropdown menu and when Setting open click on the Channel and Videos on the top menu bar