Creating a Google Display Ad splits cleanly into two paths. Pick the right one and you can have a live ad in under an hour. Pick the wrong one and you'll waste time reformatting files.
Two Paths to Create Google Display Ads
Google gives you two creation methods. Pick based on how much control you need over the final creative.
Option 1: Responsive Display Ads (Recommended for Scale)
You upload raw assets: images, logos, headlines, descriptions, and optional videos. Google's system combines them into ad variations automatically. The ads adapt to different placements across the Google Display Network. Per Google's Ads Help Center, responsive display ads improve coverage by adjusting format and size to fit available spaces.
Option 2: Uploaded Custom Display Ads (Full Design Control)
You design the ad externally, then upload the finished file. JPG, PNG, GIF, or HTML5 ZIP files all work. You control every visual element. The trade-off is manual resizing for each placement you want to cover.
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Step-by-Step: Create a Responsive Display Ad
Step 1: Access your Google Ads account and start a Display campaign
Log in to Google Ads. Click the Campaigns icon. Select "New campaign" and choose Display as the campaign type.
Step 2: Gather and prepare your assets
Prepare at least one landscape image and one square image. Have your logo ready. Write multiple short headlines, long headlines, and descriptions. Strong, varied copy gives Google more combinations to test.
Step 3: Upload assets in multiple aspect ratios
Per Google's best practices guide for responsive display ads, upload images in horizontal, square, and vertical ratios. More aspect ratios mean more eligible placements and a stronger ad strength score.
Step 4: Let Google generate and optimize ad variations
Google assembles combinations from your assets and tests them automatically. Better-performing combinations earn more impressions over time. You do not need to manage each variation manually.
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Step-by-Step: Upload a Custom Display Ad
Step 1: Design or prepare your display ad file
Build your ad at a Google-approved standard size. Target high-reach placements first, like 300x250 (Medium Rectangle) or 336x280 (Large Rectangle). Non-standard dimensions will be rejected before your ad ever runs.
Step 2: Verify size and file format requirements
Per Google's Ads Help Center, image files (JPG, PNG, GIF) must be 150 KB or under. HTML5 interactive ads must be packaged as a ZIP file, also 150 KB or under, with no more than 40 files inside. Confirm both before you upload.
Step 3: Upload to your ad group
In Google Ads, click the Campaigns icon. Navigate to your Display campaign and select the ad group. Choose "Upload display ads" and attach your file.
Step 4: Review and publish
Google reviews all uploaded ads before they go live. Check your dimensions, file size, and format before submitting. Any non-compliant asset fails review and delays your campaign.
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Critical Size and Format Requirements
Getting these specs right prevents failed uploads and disapproved ads before they happen.
Standard display ad dimensions and why they matter
Google Ads documentation states only approved, standard dimensions are accepted. Common high-performing desktop sizes include 300x250 (Medium Rectangle) and 336x280 (Large Rectangle). For mobile, 320x50 (Mobile Leaderboard) and 320x100 (Large Mobile Banner) drive strong reach. Anything outside the approved list gets rejected outright.
File size limits and accepted formats
All uploaded display ads must be 150 KB or under. Accepted formats are JPG, PNG, GIF, and HTML5 ZIP. Non-ASCII text requires UTF-8 encoding. HTML5 ZIP files cannot contain more than 40 files.
Aspect ratio recommendations for responsive ads
Upload in all three ratios: horizontal, square, and vertical. Google's documentation links asset variety directly to ad strength scores and placement eligibility. More ratios, more reach.
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Best Practices for High-Performing Display Ads
Image quality and clarity guidelines
Use sharp, high-resolution images. Low-quality visuals reduce click-through rates and weaken brand recognition. Per Google's best practices guide for responsive display ads, asset quality is a core factor in ad strength scoring.
Asset variety and format diversity
Upload multiple images per aspect ratio. More combinations give Google's optimization system more to test. More testing surfaces the creative that actually resonates with your audience.
Consistent branding and messaging
Match your logo, color palette, and tone across every asset. Inconsistent visuals create confusion and reduce audience recall across placements.
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How Coinis Accelerates Display Ad Creation
Manually building display ads means designing, resizing, exporting, and validating each file for every placement. Coinis cuts that process down to minutes.
Auto-generate compliant ad images from a product URL
The Image Ads workflow creates polished, ready-to-use ad images from a product URL or brief. Premium AI models handle the creative heavy lifting. No design team required.
Smart Resize ensures every asset meets Google's specs
Coinis Revise includes Smart Resize. It reformats any image to Google's required dimensions in one click. No manual cropping. No failed uploads from wrong sizes.
Multi-format asset library for responsive ad optimization
Every image you generate goes into your Creative Library. Pull any asset in any ratio when uploading to your responsive display ad campaign. All formats, organized and ready.
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Frequently Asked Questions
What is the best size for a Google Display Ad?
For desktop, 300x250 (Medium Rectangle) and 336x280 (Large Rectangle) are top performers. For mobile, 320x50 (Mobile Leaderboard) and 320x100 (Large Mobile Banner) drive strong reach. Per Google Ads documentation, all uploaded ads must use standard, approved dimensions. Non-standard sizes are rejected.
What file formats does Google Display Ads accept?
Google accepts JPG, PNG, and GIF for image ads, and HTML5 ZIP for interactive ads. All files must be 150 KB or under. HTML5 ZIP files cannot contain more than 40 files. Non-ASCII characters require UTF-8 encoding.
Should I use responsive or custom display ads?
Responsive display ads are the better choice for most advertisers. You upload raw assets and Google automatically builds and tests combinations across placements. Custom display ads give you full design control but require manual resizing for each placement and careful file validation before upload.