Google AdWords banner ads – Technical requirements

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File type  .SWF (Flash), .JPEG, .JPG, .PNG, .GIF
File size – 150 KB or smaller

Banner size:
Banner: 468 x 60
Leaderboard: 728 x 90
Square: 250 x 250
Small square: 200 x 200
Large rectangle: 336 x 280
Inline rectangle: 300 x 250
Skyscraper: 120 x 600
Wide skyscraper: 160 x 600
Half-page: 300 x 600
Large leaderboard: 970×90
Large mobile banner: 320 x 100
Billboard: 970 x 250