The following list and table show specifications and requirements for Android application screenshots:
File Type: JPG or PNG
Quality: 24 bit
Transparency: Not allowed
Required: At least two screenshots are required for each supporting device platform, including phones, 7-inch tablets, and 10-inch tablets, and up to six additional screenshots are permitted (all screenshots should be in the portrait mode)
Type
Dimensions (px)
Notes
Screenshots
Min: 320
Max: 3840
Maximum dimension cannot be more than twice as long as the maximum dimension.
Feature Graphic
1024 x500
The Feature Graphic is used for promotions on Google Play.
Promo Graphic
180 x 120
The Promo Graphic is used for promotions on older versions of the Android OS (earlier than 4.0). A promo graphic is optional.