Responsive Display Ads, uploaded image ads, HTML5, and lightbox formats — when to use each, what the specs are, and why format choice affects where your ads can actually appear.
Ad format is one of those decisions that most advertisers make once during campaign setup and never revisit — which is a mistake. The format you choose determines which placements you're eligible for, how much creative control you have, and what Google can optimise. I've worked with clients who spent weeks getting custom HTML5 banners designed, only to find that responsive ads consistently outperformed them because Google could test more combinations across more placements. The exam tests formats specifically because the right choice depends on your goals, resources, and targeting approach.
This comparison question is one of the most common in the Display exam — it tests understanding of the trade-off between flexibility and control.
Correct answer: B. Responsive Display Ads automatically adjust to fit any available ad space and allow Google to test asset combinations, while uploaded image ads only show in the specific sizes created
Uploaded image ads only run on placements that support the exact dimensions you've created — typically requiring 8–10 different sizes to achieve broad coverage. RDAs fit any placement because Google assembles them dynamically. For most clients I recommend RDAs as the primary format and use uploaded images as a supplement for premium placements where brand precision matters more than reach. The combination gives you both scale and control where it counts.
This tests knowledge of advanced format options beyond static banners and responsive ads.
Correct answer: B. HTML5 ads
HTML5 ads are built using web technologies — HTML, CSS, and JavaScript — and can include animation, interactive elements, countdowns, and dynamic content that static images simply can't deliver. They need to be created in Google Web Designer or uploaded as a ZIP file through the Google Ads interface. In practice, I recommend HTML5 for premium brand campaigns, automotive clients, or situations where the creative itself needs to demonstrate a product feature. For most standard campaigns, the production overhead rarely justifies the incremental performance gain over well-optimised RDAs.
Lightbox ads are a specific format that appears in the exam — they have a distinctive user interaction model worth knowing.
Correct answer: B. An expandable ad format that users actively engage with by hovering or clicking — the ad expands into a full-screen or large-format experience only when the user intentionally interacts with it
Lightbox ads start as standard banner-size ads and expand into a rich, immersive experience — video, gallery, maps, or other interactive content — only when a user deliberately engages with them. Critically, advertisers only pay when a user expands the ad (cost-per-engagement model), not for passive impressions. This makes them a good choice for campaigns where engagement quality matters more than volume. I've used them effectively for automotive and real estate clients where showing multiple product views or a video walkthrough within the ad itself significantly improved lead quality.
This practical scenario tests whether you can match format to resource constraints and reach goals.
Correct answer: C. Responsive Display Ads using uploaded asset components
RDAs require the least production work while delivering the broadest placement coverage — you upload images, logos, headlines, and descriptions once, and Google handles every size, format, and combination from there. For clients with limited design resources or agencies managing a high volume of campaigns, RDAs are the only scalable approach. The output quality depends entirely on the quality of assets you provide — which is why I spend time getting the asset brief right even when the format itself is low-effort to implement.
Technical specifications appear in the exam — knowing the file types and size limits is expected.
Correct answer: C. JPEG, PNG, and GIF files up to 150KB each
Google accepts JPEG, PNG, and GIF formats for uploaded image ads, with a maximum file size of 150KB per image. GIFs can be animated — though Google limits animation to loop no more than three times and requires it to stop within 30 seconds. In practice, I always compress images to well under 150KB before uploading — heavy files can slow ad loading, which affects both placement eligibility and user experience. Most design tools have an "export for web" option that gets files to a suitable weight without visible quality loss.
Are your Display campaigns running with a single uploaded banner in one size, missing 90% of available placements? Format strategy is one of the quickest fixes in any Display audit.
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