Example Google Display Ad for Ecademy...

Supported Ad Size Formats for Google Display Ads:

Square and rectangle

200 × 200 Small square

240 × 400 Vertical rectangle

250 × 250 Square

250 × 360 Triple widescreen

300 × 250 Inline rectangle

336 × 280 Large rectangle

580 × 400 Netboard

Leaderboard

468 × 60 Banner

728 × 90 Leaderboard

930 × 180 Top banner

970 × 90 Large leaderboard

970 × 250 Billboard

980 × 120 Panorama

Skyscraper

120 × 600 Skyscraper

160 × 600 Wide skyscraper

300 × 600 Half-page

300 × 1050 Portrait

Mobile

300 × 50 Mobile banner

320 × 50 Mobile banner

320 × 100 Large mobile banner