TL;DR: Submit images in all three core aspect ratios. Landscape (1200×628 px), square (1200×1200 px), and portrait (900×1600 px). Keep important elements in the center 80% of every frame. Pre-resize in Coinis Revise before uploading so you control exactly how each creative looks.
---
Why Resizing Matters for Google Ads Across Placements
Submit the wrong dimensions and Google either rejects your image or crops it badly.
How Google Ads uses AI to resize and adjust creatives
Per Google's Ads Help Center, responsive display ads automatically adjust size, appearance, and format to fit available ad spaces. Google's AI assembles your image and text assets into combinations it predicts will perform best. But it works best when you give it well-sized inputs.
Why submitting multiple aspect ratios expands your reach
Google Ads serves placements across the Display Network (2 million+ websites and apps), YouTube, and Performance Max. Each placement has different proportions. One aspect ratio won't cover them all. More ratios mean more eligible placements and more impressions.
The cost of poorly sized images
Undersized or single-ratio images miss placements entirely. Google may show a low-quality stretched version. Or skip your creative for that slot. Either way, you get fewer impressions than you paid to reach.
---
The Standard Aspect Ratios and Dimensions Google Ads Requires
These three ratios cover the vast majority of placements.
Landscape (1.91:1): 1200×628 px recommended
Minimum is 600×314 px. Landscape covers most Display Network banner slots and YouTube companion banners.
Square (1:1): 1200×1200 px recommended
Minimum is 300×300 px. Square is required for Performance Max campaigns. Per Google Ads documentation, square images are mandatory for any Performance Max ad group, so skipping this ratio cuts you off from the campaign type entirely.
Portrait (9:16 or 4:5): 900×1600 px recommended
Portrait covers full-screen mobile placements and vertical display inventory. It's the ratio most advertisers forget to submit.
Minimum dimensions to avoid platform penalties
Dropping below the minimums triggers a rejection or Google's built-in upscaling. Upscaling works as a backup, but starting with a properly sized image always produces sharper results.
File format and size limits
Google Ads accepts JPEG and PNG only. Maximum file size is 5 MB per image.
---
How to Resize Your Images for Multiple Placements
Three practical strategies. Use one or combine them.
Strategy 1: Submit multiple aspect ratios and let Google's AI handle it
Per Google's documentation on responsive display ads, uploading 5-10 images per aspect ratio gives Google's AI the most creative variety to work with. More image variety improves placement coverage. This is the fastest starting point for new campaigns.
Strategy 2: Pre-resize in Coinis Revise before uploading
Pre-resizing gives you control over how your creative looks at each ratio. Google's auto-crop is smart, but it doesn't know your brand priorities. Coinis Revise lets you resize to any target dimension in one click, so you see exactly what will go live before it does.
Strategy 3: Use Google's built-in image upscaling for low-res assets
Per Google Ads Help, the built-in image upscaling enhancement uses AI to resize and sharpen images that are too small to meet platform requirements. Treat it as a useful safety net, not a first choice. Start with the right resolution whenever possible.
Best practice: keep important elements centered
Keep your logo, product, and key headline within the center 80% of the frame. When Google crops or adjusts ratios, elements outside that zone get cut. This applies whether you pre-resize or let Google handle it.
---
Using Coinis Revise to Pre-Resize Before Google Upload
Coinis Revise is built for exactly this workflow. No Photoshop. No manual canvas work.
How Smart Resize works across aspect ratios
Smart Resize detects your image content. It repositions and scales elements to fit the target aspect ratio without cutting off your subject. You pick the dimension, click resize, and download. The result is a clean, platform-ready file.
When and why to resize proactively vs. letting Google handle it
Use Google's auto-resize when you're spinning up a test campaign quickly and just need basic coverage. Use Coinis Revise when creative quality matters, when you're running branded campaigns, or when you want clean variants for A/B testing.
Quick workflow: upload original, select dimensions, download
- Upload your original image to Coinis Revise.
- Select your target dimensions (1200×628, 1200×1200, or 900×1600).
- Download the resized image.
- Upload directly to Google Ads.
Four steps. Under a minute per image.
---
Testing & Optimization After Upload
How to monitor which placements your ads appear in
Check the placements report inside Google Ads to see which sites and apps your ads are running on. Filter by impression volume per size to spot coverage gaps.
Identifying underperforming sizes or placements
Low CTR on a specific placement usually signals a creative fit problem, not a bid problem. Compare performance by aspect ratio. A weak square CTR often means the square image needs a tighter composition.
Refreshing creative with resized variants if needed
Use Coinis Revise's Variate capability to generate fresh versions of your best-performing creative. Upload the variants as new image assets in your responsive display ad or Performance Max campaign to keep creative fresh.
---
Quick Checklist: Best Way to Resize for All Placements
- [ ] Create landscape image at 1200×628 px (minimum 600×314 px)
- [ ] Create square image at 1200×1200 px (minimum 300×300 px)
- [ ] Create portrait image at 900×1600 px
- [ ] Keep key elements inside the center 80% of every frame
- [ ] Save as JPEG or PNG, under 5 MB
- [ ] Upload 5-10 images per aspect ratio for responsive display and Performance Max
- [ ] Pre-resize in Coinis Revise for branded or high-spend campaigns
- [ ] Check your placements report after 7 days and refresh low-CTR sizes
---
Or let Coinis do it.
From a product URL to a live Meta campaign. AI-generated creatives. On-brand copy. Direct publish to Facebook and Instagram. Real performance reporting. All in one platform.
Start free. Upgrade when you're ready.
15 AI tokens a month. No credit card.
Frequently Asked Questions
What image sizes does Google Ads require for responsive display ads?
Google recommends three aspect ratios: landscape (1200×628 px, minimum 600×314 px), square (1200×1200 px, minimum 300×300 px), and portrait (900×1600 px). Submitting all three maximizes the placements your ads are eligible for across the Display Network, YouTube, and Performance Max.
Does Google automatically resize my images for different placements?
Yes. Google's responsive display ads use AI to adjust your image assets to fit available ad spaces. However, Google works best when you provide well-sized inputs in multiple aspect ratios. Starting with properly sized images at each ratio always produces sharper, more consistent results than relying on auto-crop alone.
What happens if my image is too small for Google Ads?
Per Google Ads Help, the platform's built-in image upscaling enhancement uses AI to resize and sharpen images that fall below minimum size requirements. It's a useful fallback, but not a substitute for uploading correctly sized images from the start.
Why are square images required for Performance Max campaigns?
Per Google Ads documentation on Performance Max, square images are mandatory at the ad group level. Without a square image, Google cannot serve your ads across all Performance Max placements. Landscape and portrait images expand your reach further, but square is the non-negotiable baseline.