The Google Display Network reaches over 90% of internet users worldwide, serving ads across millions of websites, apps, and Google properties. But with dozens of possible ad sizes, knowing which dimensions to prioritize can be overwhelming. This guide covers every Google Display ad size and helps you choose the right ones for your campaigns.
Understanding Google Display Network Placements
GDN ads appear across a vast network of websites and apps. Different placements favor different ad sizes, so having multiple sizes in your campaign gives you access to more inventory and often lower CPMs.
Top-Performing Google Display Ad Sizes
While Google supports many sizes, these five account for the majority of available inventory and should be your priority:
1. Medium Rectangle (300 x 250)
The most versatile and widely supported size. It fits within content, sidebars, and end-of-article placements. Always include this size in your campaigns.
2. Large Rectangle (336 x 280)
A larger version of the medium rectangle with higher visibility. Performs well on desktop and tablet.
3. Leaderboard (728 x 90)
A horizontal banner typically placed at the top of pages. High visibility but primarily desktop-only.
4. Mobile Leaderboard (320 x 50)
Essential for mobile placements. This compact format appears at the top or bottom of mobile screens.
5. Large Mobile Banner (320 x 100)
Twice the height of the mobile leaderboard, offering more creative space on mobile devices.
Complete Google Display Ad Size List
Desktop and Tablet Sizes
| Name | Dimensions | Usage |
|---|---|---|
| Medium Rectangle | 300 x 250 | Universal, highest inventory |
| Large Rectangle | 336 x 280 | High visibility, content areas |
| Leaderboard | 728 x 90 | Page headers |
| Half Page | 300 x 600 | Sidebars, high impact |
| Wide Skyscraper | 160 x 600 | Sidebars |
| Skyscraper | 120 x 600 | Narrow sidebars |
| Billboard | 970 x 250 | Premium placements |
| Large Leaderboard | 970 x 90 | Wide page headers |
| Square | 250 x 250 | Flexible placement |
| Small Square | 200 x 200 | Limited inventory |
| Small Rectangle | 180 x 150 | Limited inventory |
| Portrait | 300 x 1050 | Premium, high impact |
Mobile Sizes
| Name | Dimensions | Usage |
|---|---|---|
| Mobile Leaderboard | 320 x 50 | Mobile headers/footers |
| Large Mobile Banner | 320 x 100 | Mobile, more visible |
| Mobile Full Banner | 468 x 60 | Mobile and tablet |
| Mobile Medium Rectangle | 300 x 250 | Mobile content areas |
Responsive Display Ads
Google's Responsive Display Ads automatically adjust size and format to fit available placements. You provide:
- Images: Up to 15 images in landscape (1200 x 628) and square (1200 x 1200)
- Logos: Up to 5 logos in square (1200 x 1200) and landscape (1200 x 300)
- Headlines: Up to 5 headlines (30 characters each)
- Long headline: 1 long headline (90 characters)
- Descriptions: Up to 5 descriptions (90 characters each)
Google's machine learning then combines these assets to create ads optimized for each placement. Google Ads AI are often the best choice for reaching maximum inventory with minimal production effort.
Image Specifications
For all Google Display ads:
- File types: JPG, PNG, GIF (static or animated)
- Maximum file size: 150KB
- Animated GIF: Maximum 30 seconds, looping allowed
HTML5 Display Ads
For more advanced creative, Google supports HTML5 ads through Google Web Designer or third-party tools:
- Maximum file size: 150KB (initial load)
- Maximum total size: 2.2MB (including subsequent loads)
- Animation length: Maximum 30 seconds
Display Ad Creative Best Practices
Keep It Simple
Banner ads have limited space. Focus on one clear message, one strong visual, and one CTA. Cluttered banners underperform.
Brand Consistently
Include your logo in every banner. Users should recognize your brand instantly. Use consistent colors and fonts across all sizes.
Use Strong CTAs
Display ads need clear calls-to-action. Use button-style CTAs with action words: "Shop Now," "Get Quote," "Learn More."
Animate Strategically
Motion attracts attention, but don't overdo it. Subtle animation or a single animated element often works better than complex movement.
Create All Priority Sizes
Don't limit your reach. Create at least the top 5 sizes to access the majority of available inventory. More sizes = more opportunities.
Quick Start: Which Sizes to Create First
If you're starting a new campaign, create these sizes first:
- 300 x 250 (Medium Rectangle) — Essential
- 300 x 600 (Half Page) — High impact
- 728 x 90 (Leaderboard) — Desktop headers
- 320 x 50 (Mobile Leaderboard) — Mobile essential
- 320 x 100 (Large Mobile Banner) — Mobile visibility
Once these are performing, expand to additional sizes to increase reach.
Generate All Display Sizes Instantly
Creating banners in multiple sizes is time-consuming. With AI Ad Creative Generator, generate all Google Display sizes from a single creative concept. Our AI maintains visual consistency while optimizing layouts for each dimension. Create a complete display campaign in minutes.
For insights on How to Scale Ad Creatives and measure Ad Creative Performance Metrics, explore our resources.