Google Display Ads Sizes: Complete Specifications for Maximum Impact

Looking for the right Google Display Ad sizes in 2025? Here’s what you need to know:

Most effective ad sizes:

Medium Rectangle (300×250) – Works on desktop and mobile Leaderboard (728×90) – Perfect for desktop headers Half Page (300×600) – Great for sidebars Mobile Banner (320×50) – Mobile-optimized Large Mobile Banner (320×100) – Enhanced mobile visibility

Key technical specs:

File size limit: 150KB max Supported formats: PNG, JPG, GIF Text limit: Keep under 20% of image area

Quick size guide:

Ad TypeSizeBest For Medium Rectangle300×250All devices Leaderboard728×90Desktop headers Half Page300×600Sidebars Mobile Banner320×50Mobile screens

Pro tip: Use responsive display ads