Google Display Ads reach 90% of internet users worldwide. But having reach isn’t enough. If your design is cluttered, blurry, or the wrong file size, Google will either reject it or charge you more per click.
In this guide, we break down exactly how to design banners that Google loves—and how to validate them before you spend a dime.
⚠️ Don’t Get Rejected
Google strictly enforces file size limits (150KB for most). Check your files instantly before uploading:
The 3 “Must-Have” Google Sizes
Google accepts over 20 different ad sizes, but you don’t need to design them all. According to performance data, these three formats account for the vast majority of traffic:
1. The Medium Rectangle (300×250)
Why it works: It fits inside text content on both desktop and mobile. It has the highest inventory availability of any size.
2. The Leaderboard (728×90)
Why it works: It sits at the top of the page (above the fold). It is excellent for keeping your brand name visible.
3. The Half Page (300×600)
Why it works: This large format takes up significant real estate on the sidebar. It offers the highest engagement rates because it’s hard to miss.
Design Rules for Higher CTR
1. The Value Proposition
Don’t just put your logo on a banner. You need to answer “What’s in it for me?” instantly. Use words like “Free,” “Save,” or “Now.”
2. The Button (CTA)
Google’s data shows that banners with a visible CTA Button perform better. Even though the whole image is clickable, a button like “Shop Now” tells the user exactly what to do.
3. Branded Colors
Your banner should look like your landing page. If a user clicks a blue banner and lands on a red website, they will bounce. Use our free Color Palette Tool to ensure your ad matches your brand perfectly.
Tools We Recommend
To create Google-compliant ads quickly without getting rejected for file size or quality, we recommend:
1. AdCreative.ai (Best for Automation)
Why we love it: Resizing banners for Google’s 20+ formats takes hours. AdCreative.ai does it in seconds. It uses AI to generate high-conversion, Google-compliant creatives instantly.
2. Envato Elements (Best for Assets)
Why we love it: A pixelated image will get your ad rejected by Google. Envato gives you unlimited downloads of professional stock photos, graphics, and fonts so your ads always look premium.
3. Fiverr (Best for Custom HTML5)
Why we love it: Google HTML5 ads require complex coding. If you aren’t a developer, don’t risk a broken ad. Hire a vetted freelancer on Fiverr to build a custom, bug-free HTML5 banner for you.
Final Checklist
Before you upload to Google Ads Manager:
- Is your file size under 150KB?
- Is your text readable on a phone screen?
- Did you include a clear Call to Action?
Not sure about the size? Use our Master Cheat Sheet to verify every file: