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% | 600 KB max HTML5 ZIP |
| Leaderboard | 728 × 90 px | ~25% | 600 KB max HTML5 ZIP |
| Half Page / Filmstrip | 300 × 600 px | ~15% | 600 KB max HTML5 ZIP |
| Mobile Banner | 320 × 50 px | ~12% | 600 KB max HTML5 ZIP |
| Large Banner (Mobile) | 320 × 100 px | ~8% | 600 KB max HTML5 ZIP |
Technical Requirements for Google Display Ads
- Compressed HTML5 ZIP: 600 KB maximum for uploaded Google Ads creatives, with no more than 40 files.
- clickTag Declaration: Must use standard
var clickTag = "https://...";insideindex.html. - Supported libraries: Use supported Google hosted libraries where permitted; bundle all other images, sounds, CSS, and JavaScript inside the ZIP.
Validate your HTML5 ZIP packages instantly before launching with our HTML5 Banner Validator.