As you know that Facebook has added option of Cover picture in Timeline profiles.You can add your bigger size photo in your Timeline profile or page as a cover.But, some times you can not choose the exact dimensions of photo for your cover, Because many people don’t know the correct Facebook cover size (Width & Height).
In this tutorial I will share exact dimensions for your Facebook Profile Picture and TimeLine Cover Picture.
The exact size for Timeline cover picture is 851px x 315px. But you can upload larger photos because you can still drag and crop them to re-size the cover.If you will upload cover image is less than the expected size then you will see message in pop-up “Your cover photo needs to be at least 399 pixels wide. Please choose a different image.”For example see image below to know exact size about your Facebook cover or profile picture: