The top-performing Google Display ad sizes are 300 × 250 px (Medium Rectangle), 728 × 90 px (Leaderboard), 160 × 600 px (Wide Skyscraper), and 320 × 50 px (Mobile Banner).
Google Display Network runs on 3+ million websites. Serving the right creative in the right slot dramatically improves reach and click-through. Here are the 2026 IAB standard display ad sizes.
| Asset | Dimensions | Ratio | Format | Max size |
|---|---|---|---|---|
| Medium Rectangle | 300 × 250 | 1.2:1 | JPG / PNG / GIF | 150 KB |
| Leaderboard | 728 × 90 | 8.1:1 | JPG / PNG / GIF | 150 KB |
| Wide Skyscraper | 160 × 600 | 1:3.75 | JPG / PNG / GIF | 150 KB |
| Large Rectangle | 336 × 280 | 1.2:1 | JPG / PNG / GIF | 150 KB |
| Mobile Banner | 320 × 50 | 6.4:1 | JPG / PNG / GIF | 150 KB |
| Large Mobile Banner | 320 × 100 | 3.2:1 | JPG / PNG / GIF | 150 KB |
| Half Page | 300 × 600 | 1:2 | JPG / PNG / GIF | 150 KB |
| Billboard | 970 × 250 | 3.88:1 | JPG / PNG / GIF | 150 KB |
Pro tip: Google recommends uploading Medium Rectangle (300 × 250), Leaderboard (728 × 90), and Mobile Banner (320 × 50) as a minimum set — these three cover ~80% of all display inventory.
Source: Google Ads Help
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Why Google Display Ad Size Matters
Publisher pages allocate fixed pixel space for ads. If your creative doesn't match any of the standard IAB slots on a page, Google can't serve it — even if you have the highest bid. Uploading the top four sizes (300 × 250, 728 × 90, 160 × 600, 320 × 50) covers the vast majority of available inventory.
Responsive Display Ads vs Static Image Ads
Responsive Display Ads let you upload a few source assets (landscape 1200 × 628, square 1200 × 1200, and a logo) and Google generates every ad size automatically. This maximizes reach but sacrifices design control. Static image ads at exact IAB sizes give you pixel-perfect creative but require you to design each size yourself.
Common mistakes to avoid
- Uploading only 300 × 250 — you miss the 728 × 90 desktop leaderboard slot, the highest-visibility placement.
- Files over 150 KB — Google rejects them.
- Text that's too small to read at 320 × 50 — mobile users can't parse it.
Frequently asked questions
What are the top Google Display ad sizes in 2026?
The four highest-inventory sizes are 300 × 250 (Medium Rectangle), 728 × 90 (Leaderboard), 160 × 600 (Wide Skyscraper), and 320 × 50 (Mobile Banner).
What is the maximum file size for a Google Display ad?
150 KB across every image ad format.
Which Google Display ad size performs best?
The 300 × 250 Medium Rectangle historically has the highest fill rate and CTR because it's supported on the widest range of publisher pages.
What ad formats does Google Display support?
JPG, PNG, and GIF for image ads. Responsive display ads accept up to 15 images that Google resizes automatically.
Do I need to upload every ad size for a Google Display campaign?
No — Responsive Display Ads let you upload landscape (1200 × 628), square (1200 × 1200), and logo, and Google generates every size automatically. Static image ads let you control the design precisely.
What is the size of a Google Display billboard ad?
The Billboard ad size is 970 × 250 px — a premium desktop-only unit that appears at the top of publisher pages.