Google Display Ad Sizes & Specs (2026 US Cheat Sheet)
Running programmatic campaigns on the Google Display Network (GDN) requires deploying the highest-volume display ad dimensions to maximize ad fill rate and lower your CPMs across US media buyers.
Top 5 Highest Performing US Banner Sizes
| Ad Format | Dimensions | US Market Impression Share | File Size Limit |
|---|---|---|---|
| Medium Rectangle | 300 × 250 px | ~40% | 150 KB max ZIP |
| Leaderboard | 728 × 90 px | ~25% | 150 KB max ZIP |
| Half Page / Filmstrip | 300 × 600 px | ~15% | 150 KB max ZIP |
| Mobile Banner | 320 × 50 px | ~12% | 150 KB max ZIP |
| Large Banner (Mobile) | 320 × 100 px | ~8% | 150 KB max ZIP |
Technical Requirements for Google Display Ads
- Initial Compressed File Size: 150 KB maximum ZIP bundle.
- clickTag Declaration: Must use standard
var clickTag = "https://...";insideindex.html. - Supported CDNs: Only Google-hosted libraries (GSAP, CreateJS, jQuery) are permitted without counting toward your 150 KB budget.
Validate your HTML5 ZIP packages instantly before launching with our HTML5 Banner Validator.