- Use 1200 × 628 for landscape and 1200 × 1200 for square - recommended sizes outperform minimums.
- Performance Max needs images in three aspect ratios: 1.91:1, 1:1, and 4:5.
- All Google Ads campaign images must be JPG or PNG, under 5 MB.
- Google's AI upscaling can rescue undersized images, but it's a safety net - not a strategy.
- Coinis Revise Smart Resize outputs every Google Ads dimension from one upload in one click.
Resize the wrong way and your Google ad image gets rejected or crops awkwardly. Here's the right way, campaign type by campaign type.
Why Image Size Matters for Google Ads
Image dimensions determine whether your ad runs at all. They also affect where it shows up.
Ad eligibility and campaign requirements
Google checks every uploaded image against hard minimums. An image below the minimum for its aspect ratio is flagged as ineligible. Google either skips it or pauses the asset group.
How undersized images impact ad strength and performance
Performance Max grades every asset group with an "Asset strength" score. More eligible images across all three aspect ratios means higher strength. Higher strength means more placement options and more competitive auctions.
The difference between minimum and recommended sizes
Minimums make you eligible. Recommended sizes make you competitive. Per Google's Ads Help Center, recommended dimensions produce sharper results across every placement. Always use recommended.
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Google Ads Image Size Requirements by Campaign Type
Specs vary by campaign type. These are the numbers that matter.
Performance Max: horizontal, square, and vertical specs
Per the Google Ads Help Center:
| Aspect Ratio | Recommended | Minimum |
|---|---|---|
| Horizontal (1.91:1) | 1200 × 628 px | 600 × 314 px |
| Square (1:1) | 1200 × 1200 px | 300 × 300 px |
| Vertical (4:5) | 960 × 1200 px | 480 × 600 px |
You need at least 7 images total: 3 landscape, 3 square, 1 portrait. Format: JPG or PNG only. Max file size: 5 MB. Keep critical content inside the center 80% of the frame.
Responsive Display Ads: landscape and square requirements
| Aspect Ratio | Recommended | Minimum |
|---|---|---|
| Landscape (1.91:1) | 1200 × 628 px | 600 × 314 px |
| Square (1:1) | 600 × 600 px | 300 × 300 px |
You can upload up to 15 images across all aspect ratios. Max file size: 5 MB.
Demand Gen campaigns: image dimensions and aspect ratios
Demand Gen uses the same horizontal spec as Performance Max. Recommended: 1200 × 628 px. Minimum: 600 × 314 px at a 1.91:1 aspect ratio.
Display Network uploaded ads: standard banner sizes
Uploaded display ads follow IAB standard banner sizes. The most widely served are 300 × 250, 728 × 90, and 320 × 50. Note the lower file size limit here: 150 KB per ad. JPG and PNG are supported.
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Step-by-Step: Resizing Images for Google Ads
Follow these steps in order. Skipping any step leads to distortion or rejections.
Step 1: Identify your campaign type and required aspect ratio
Check which campaign you are building. Performance Max, Responsive Display, Demand Gen, and uploaded Display all have different aspect ratios and dimension requirements.
Step 2: Check recommended vs. minimum dimensions
Use the tables above. Pick the recommended size for your aspect ratio, not the minimum. The minimum keeps you eligible. The recommended size keeps you performing.
Step 3: Resize to the recommended size (not minimum)
Open your image editor. Set the canvas to the recommended pixel dimensions. Maintain the original aspect ratio before resizing to avoid stretching.
Step 4: Export as JPG or PNG and verify file size
Save as JPG or PNG. Check the file size before uploading. Campaign images must stay under 5 MB. Uploaded Display ads must stay under 150 KB.
Step 5: Upload and let Google's AI upscaling optimize if needed
Google Ads includes an image upscaling enhancement. Per Google's documentation, it automatically resizes images that fall below minimum thresholds while preserving quality. Treat it as a safety net, not a substitute for proper sizing.
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Best Practices for Image Resizing
Always use recommended sizes, not just minimum specs
Minimum specs keep you eligible. Recommended specs keep you visible across more placements. Google's algorithm favors assets that fit cleanly everywhere.
Maintain aspect ratio to avoid distortion
Crop or pad before you resize. Never stretch. Distorted images look unprofessional and often fail policy review.
Prepare multiple images in each aspect ratio
Performance Max performs better with more assets. Google recommends 5 to 20 images per asset group. Three aspect ratios means three separate resizing passes for every image.
Use high-quality source images before resizing
Start with the highest resolution original you have. Downscaling a large file produces clean output. Upscaling a small file produces blur.
Upload in JPG or PNG format to preserve quality
Google Ads accepts JPG and PNG for campaign images. PNG preserves detail in images with text overlays. JPG keeps file sizes smaller for photos.
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How Coinis Revise Helps You Resize Faster
Coinis does not currently publish directly to Google Ads. Direct Google publishing is on the roadmap. What Coinis does today: it generates and resizes your images so they are ready to upload yourself.
Smart Resize: one-click resizing for all Google Ads dimensions
Coinis Revise includes Smart Resize. Upload your image once. Smart Resize outputs every aspect ratio you need in one click. No manual cropping. No math on dimensions.
Aspect ratio preservation and quality optimization
Smart Resize keeps your subject centered and preserves the correct aspect ratio. It does not stretch or distort. Output meets Google's recommended dimensions, not just minimums.
Batch resizing multiple images at once
Need 15 images across three aspect ratios? Smart Resize handles them together. Upload your batch, select the output formats, and export.
Integration with Image Ads workflow for end-to-end creation
Start from a product URL in the Image Ads workflow. Coinis generates on-brand ad images using premium AI models. Then run Smart Resize to produce every Google Ads dimension before uploading.
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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 image size does Google Ads recommend for Performance Max?
Google recommends 1200 × 628 px for horizontal (1.91:1), 1200 × 1200 px for square (1:1), and 960 × 1200 px for vertical (4:5). You need at least 7 images across all three aspect ratios.
What file formats does Google Ads accept for images?
JPG and PNG are accepted for campaign images in Performance Max, Responsive Display, and Demand Gen. The max file size is 5 MB. Uploaded Display Network ads also support a 150 KB limit.
What happens if my image is too small for Google Ads?
Google Ads will flag the image as ineligible. The asset may be skipped or the asset group paused. Google does offer an AI upscaling enhancement for images near the minimum threshold, but you should always aim for recommended dimensions.
Do I need different image sizes for each Google Ads campaign type?
Yes. Performance Max, Responsive Display Ads, and Demand Gen each have their own required dimensions and aspect ratios. Uploaded Display Network ads follow separate IAB standard banner sizes with a much lower 150 KB file size limit.