Now banner formats for the mobile version of the Yandexs Home page are 640×134 and 220×50 px. File format can be gif, jpg, or png, and the file size per banner has been increased to 60 KB.
Advertising materials are automatically compressed down to 320×67 and 220×50 px on Yandexs end using a technology which ensures high image sharpness during ad serving.
Details about banner ads on the mobile Home page are available in the corresponding section.