> Quick answer: Google ad dimensions depend on the format. Display Network uses fixed sizes like 300x250 and 728x90. Responsive display ads need images at least 1500px wide. Performance Max needs 1:1, 4:5, and 1.91:1 aspect ratios. All image files must be JPG or PNG under 5MB.
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Google ads don't have one universal size. The format you choose determines every dimension rule. Get it wrong and your creative gets rejected or cropped.
What are Google ad dimensions and why they matter
Ad dimensions define how your creative fits a placement. Wrong sizes mean rejected assets, distorted images, or ads that simply don't serve at all.
Why different ad formats require different sizes
Google places ads across Search, Display, YouTube, Discover, Gmail, and Maps. Each surface has different physical space. A leaderboard banner fits a desktop website. It won't fit a mobile app inventory slot. Every format has its own constraints.
Display Network vs. responsive vs. Performance Max ads
Google offers three main types for visual campaigns. Uploaded display ads use fixed pixel dimensions you define. Responsive display ads let Google auto-assemble your assets across sizes. Performance Max campaigns serve across every Google channel at once, using all three major aspect ratios.
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Google Display Network ad sizes
The Display Network places ads on websites, apps, and Gmail. Per the Google Ads Help Center, these standard fixed dimensions cover the majority of available inventory.
Most common desktop ad sizes (300x250, 728x90, 970x90)
| Ad Size | Common Name |
|---|---|
| 300x250 | Medium Rectangle |
| 728x90 | Leaderboard |
| 970x90 | Large Leaderboard |
The 300x250 medium rectangle is the most widely supported size on the entire Display Network. Start here if you're choosing only one.
Mobile ad sizes (320x50, 320x100)
| Ad Size | Common Name |
|---|---|
| 320x50 | Mobile Banner |
| 320x100 | Large Mobile Banner |
The mobile banner is essential for any campaign targeting phone users. The large mobile banner grabs more screen space but has fewer available placements.
How to choose which sizes to use
Start with 300x250, 728x90, and 320x50. Those three cover the vast majority of Display Network inventory. Add 320x100 and 970x90 to push reach further. Uploading more sizes gives Google more chances to serve your ad.
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Responsive display ads: asset dimensions
Responsive display ads automatically adapt to open placements. You supply the images and copy. Google handles the assembly and sizing.
Minimum image width and aspect ratio rules
Per Google Ads documentation, images must be at least 1500px wide. Google will not accept undersized assets. You also need a minimum of two images per responsive ad, one landscape and one square.
Landscape vs. square image requirements
Landscape images follow a 1.91:1 aspect ratio. Square images follow a 1:1 ratio. Both must meet the 1500px minimum width. Providing both ratios lets Google fill a much wider range of placements.
File format and size limits
Google accepts JPG and PNG only. Maximum file size is 5MB (5120 KB) per image. Files larger than this will fail on upload. Keep your exports within that ceiling.
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Performance Max ads: aspect ratios and image specifications
Performance Max campaigns run across every Google surface simultaneously. That means one campaign can appear on Search, Display, YouTube, Discover, Gmail, and Maps. To do that, your images need to cover every major aspect ratio.
Square (1:1) images: 1200x1200 recommended
Per the Google Ads Help Center documentation for Performance Max, the recommended square image size is 1200x1200 pixels. This format covers Display, Discover, and Gmail placements well.
Portrait (4:5) images: 960x1200 recommended
Portrait images use a 4:5 ratio. The recommended size is 960x1200 pixels. This format performs strongly in mobile-heavy placements where vertical space is available.
Landscape (1.91:1) images: 1200x628 recommended
Landscape images use a 1.91:1 ratio. Google recommends 1200x628 pixels here. This is the most versatile format and serves well across the broadest range of Google surfaces.
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Best practices for ad images across all formats
Keep important content in the center 80%
Per Google's image asset policy, all important content must sit inside the center 80% of the image. Google crops outer edges when adapting images to different placements. Logos, product shots, and any text belong in that safe zone.
Upload as JPG or PNG
Google accepts JPG and PNG across all ad types. Other formats are rejected on upload. Keep each file under 5MB or it won't go through.
Test multiple dimensions for performance
Don't stop at the minimum asset count. Upload every supported size you can produce. Google's machine learning selects the best-performing assets per placement automatically. More assets mean more data and better optimization over time.
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How Coinis Revise solves dimension challenges
Managing five Display sizes, two responsive ratios, and three Performance Max ratios means up to ten image variants from a single creative. That's a lot of manual resizing.
Coinis Revise handles this with Smart Resize. Upload your base image, set the target dimensions, and the AI repositions key content to fit. No manual cropping. No guessing whether the logo is still in frame.
The same tool covers every other dimension-related edit too. Move text, change text, erase objects, upscale a low-res asset, or translate copy for international campaigns. One editor. Every Google dimension problem.
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Or skip the steps.
Coinis Revise edits any ad image with AI. Move text. Change text. Swap colors. Erase objects. Translate to any language. One click each.
No design skills. No Photoshop. One click.
15 AI tokens a month. No credit card.
Frequently Asked Questions
What is the most common Google Display Network ad size?
The 300x250 medium rectangle is the most widely supported size on the Display Network. It's a strong first choice for any campaign and covers the majority of available placements.
What image dimensions does Performance Max require?
Performance Max needs images in three aspect ratios: 1:1 (1200x1200 pixels recommended), 4:5 (960x1200 pixels recommended), and 1.91:1 (1200x628 pixels recommended). Google recommends uploading at least one image per ratio.
What file formats does Google accept for ad images?
Google accepts JPG and PNG only across all ad types. Maximum file size is 5MB per image. Files in other formats or over the size limit will be rejected on upload.
What does 'center 80%' mean in Google Ads image policy?
Google may crop the outer edges of your image when adapting it to different placements. Keeping logos, product shots, and text within the center 80% of the frame ensures nothing important gets cut off.