If you’re running Google display ads, choosing the right banner size directly impacts your impressions, clicks, and conversions.
Display ads appear on websites across Google’s network, including blogs, news sites, and niche platforms. They build brand awareness and drive traffic, while also working well for remarketing campaigns.
Getting banner ad sizes wrong is a common mistake that wastes ad spend. Let’s look at which sizes actually perform and how to use them effectively.
Table of Contents
Key Takeaways
- Google Ads accepts 10 standard display banner sizes, all with a 150 KB maximum file size limit regardless of dimensions.
- Five sizes consistently deliver the best results in 2025: 300×250 (Medium Rectangle), 336×280 (Large Rectangle), 728×90 (Leaderboard), 300×600 (Half Page), and 320×50 (Mobile Leaderboard).
- The 300×250 Medium Rectangle is the most versatile format, fitting naturally within text content, sidebars, and end-of-article placements without disrupting the reader’s experience. It’s the recommended starting point for new display campaigns.
- Mobile traffic accounts for the majority of web browsing in 2025, so the 320×50 Mobile Leaderboard is a required format for any mobile-first advertising strategy.
- Size selection should match campaign objective: use 728×90 or 300×600 for brand awareness, 300×250 or 336×280 for content integration, and 320×50 for mobile targeting.
Standard Google Banner Ad Sizes
Here are the most common banner ad dimensions accepted by Google Ads:
| Dimension | Name | Maximum File Size |
|---|---|---|
| 250 x 250 | Square | 150 KB |
| 200 x 200 | Small Square | 150 KB |
| 468 x 60 | Banner | 150 KB |
| 728 x 90 | Leaderboard | 150 KB |
| 300 x 250 | Inline Rectangle | 150 KB |
| 336 x 280 | Large Rectangle | 150 KB |
| 120 x 600 | Skyscraper | 150 KB |
| 160 x 600 | Wide Skyscraper | 150 KB |
| 300 x 600 | Half-Page Ad | 150 KB |
| 970 x 90 | Large Leaderboard | 150 KB |
Top Performing Banner Ad Sizes in 2025
Based on current performance data, these five sizes consistently deliver the best results:
| Dimension | Name | Maximum File Size |
|---|---|---|
| 300 x 250 | Medium Rectangle | 150 KB |
| 336 x 280 | Large Rectangle | 150 KB |
| 728 x 90 | Leaderboard | 150 KB |
| 300 x 600 | Half Page | 150 KB |
| 320 x 50 | Mobile Leaderboard | 150 KB |
a. 300 x 250 (Medium Rectangle)
The medium rectangle is probably the most versatile banner size you’ll work with. It fits naturally within text content and at the end of articles without disrupting the reader’s experience.
Publishers love this size because it integrates smoothly into their page layouts. If you’re new to display advertising, start here.
Best placement: Embedded in content, sidebar, end of articles
b. 336 x 280 (Large Rectangle)
Think of this as the medium rectangle’s bigger sibling. It works well in the same placements while giving you a bit more visual space for your message and creative elements.
The slightly larger format can improve visibility without feeling intrusive to users.
Best placement: Within content, sidebar, below articles
c. 728 x 90 (Leaderboard)
The leaderboard sits prominently at the top or bottom of web pages, so it captures attention right away. This horizontal format gets high visibility and performs particularly well on forum sites and content-heavy pages.
Best placement: Top of page, bottom of page, above content
d. 300 x 600 (Half Page)
The half page ad gives you the most creative space of any standard banner size. This vertical format really stands out and provides room for detailed messaging and compelling visuals.
Use this size when you need to tell a more complete story or showcase multiple products.
Best placement: Sidebar, right rail on desktop sites
e. 320 x 50 (Mobile Leaderboard)
Mobile traffic makes up the majority of web browsing in 2025, so you can’t ignore this format. The mobile leaderboard is built specifically for small screens and delivers strong performance on smartphones and tablets.
This format is essential if you want a mobile-first advertising strategy.
Best placement: Top or bottom of mobile pages, between content sections
Why Banner Ad Dimensions Matter
Banner ad size affects how visible your ad is, how users experience it, and ultimately how well your campaign performs. The right dimensions help your ads get noticed without annoying users.
Different sizes work better in different contexts. A leaderboard catches attention at the top of a page, while a medium rectangle blends naturally into article content.
Your goal is getting clicks and conversions, not just impressions. Choosing the right size gives your creative the best shot at performing well.
How to Choose the Right Banner Size
Start with the five top-performing sizes we listed above. Most websites support these formats, which gives you broad reach across Google’s display network.
Think about what you’re trying to accomplish:
- Brand awareness: Use larger formats like 728×90 or 300×600
- Content integration: Choose 300×250 or 336×280
- Mobile targeting: Prioritize 320×50
Run A/B tests with different sizes to see what works for your specific audience and industry. Performance varies by niche, so let your data guide your decisions.
Key Elements Beyond Size
Banner dimensions are just one piece of the puzzle. You also need to focus on:
- Copy: Clear, concise messaging that speaks to your audience
- Design: Clean visuals that align with your brand
- Call to action: Direct, action-oriented CTAs
- Color scheme: High contrast for readability
- File optimization: Keep files under size limits so they load fast
Tools and Resources for Banner Creation
Creating banners in multiple sizes while keeping them under file size limits can be challenging. Here are the tools that actually make a difference:
Design and Creation Tools
Bannersnack is built specifically for this problem. Instead of recreating each banner size manually, you can:
- Start with pre-set templates for all standard Google ad sizes
- Resize your design to generate multiple banner sizes with one click
- Keep exports under 150 KB with built-in file optimization
- Export directly in the format Google Ads expects
- Use brand kit features so all your banners stay consistent
If you’ve ever spent hours recreating the same banner in five different sizes, you’ll appreciate how much time this saves.
- Adobe Photoshop gives you complete creative control if you have design experience. It handles manual resizing and compression well, but you’ll need to create each size separately.
- Canva has templates for common banner sizes and works fine for basic designs. It’s good for simple banners but doesn’t have the advanced resizing features you might need.
- GIMP is a free alternative to Photoshop if you want to design and edit banners manually.
Image Optimization Tools
- ShortPixel compresses your banner files while keeping them looking good. This is really helpful when you’re trying to stay under the 150 KB limit.
- TinyPNG and Compressor.io do similar things and work well for quick file size reductions.
Why Bannersnack Makes Sense
Here’s the reality: traditional design tools make you create each banner size from scratch. When you need five or more variations, that gets tedious fast.
Bannersnack solves this by letting you design once and generate all the sizes you need automatically. Each version stays within file size requirements and exports in the right format for Google Ads.
If you’re managing multiple campaigns or working with a team, the brand management features help keep everything consistent while still letting you update all sizes quickly when needed.
Best Practices for 2025
- Mobile first: Always create mobile-optimized versions (320×50, 300×250)
- Responsive ads: Use Google’s responsive display ads to automatically adjust sizes
- Load speed: Optimize file sizes so pages don’t slow down
- Quality over quantity: Better to have five great sizes than ten mediocre ones
- Test continuously: Monitor performance and adjust based on what you see in the data
- Use resizing tools: Save yourself time by using platforms that generate multiple banner sizes automatically
Conclusion
Start with the five top-performing banner sizes: 300×250, 336×280, 728×90, 300×600, and 320×50. These formats give you the reach and flexibility you need for effective display campaigns.
Test different sizes against your specific audience to find what delivers the best ROI for your business. Combine the right dimensions with strong creative and clear messaging, and you’ll see better results from your display advertising.
