Best Google Display Ad Sizes for 2025

In 2025, display advertising remains one of the most scalable ways to expand reach, reinforce brand visibility, and drive conversions across Google’s ecosystem. But as competition increases and placements diversify across mobile, desktop, apps, and connected devices, one factor matters more than ever: choosing the right ad sizes.

On the Google Display Network (GDN)—which reaches more than 90% of global internet users—the size of your creative directly influences impression volume, viewability, click-through rates, and even cost efficiency. This guide breaks down the most effective Google Display Ad sizes for 2025, the logic behind each format, and best practices for selecting the right mix to maximize ROI.

H1: Why Display Ad Sizes Matter in 2025

Choosing the correct ad dimensions is not merely a design choice; it is an optimization decision that shapes how often—and where—your ads appear. In a network as large as GDN, ad size affects three core performance drivers:

H2: 1. Visibility and Reach

Publishers prioritize standardized sizes to maintain consistent layouts. When advertisers use highly supported dimensions, their ads naturally earn more placements. Google’s internal benchmarks show that sizes such as 300×250, 728×90, and 320×100 make up the majority of available inventory across the network.

H2: 2. Engagement and CTR

Ads that match the flow of surrounding content perform better. For example, medium rectangles placed within or between paragraphs often achieve higher engagement because they feel native to the page layout. Meanwhile, oversized formats like 300×600 deliver strong impressions due to their dominant visual presence.

H2: 3. Conversion and Brand Impact

Larger or more premium sizes—such as 970×250 billboards—are ideal for storytelling, product showcases, and campaigns where creative depth improves conversion intent. These placements also reinforce brand memory through repetitive exposure in high-visibility areas.

H1: Comprehensive List of Google Display Ad Sizes

Google supports dozens of ad dimensions across standard image banners, responsive formats, app placements, and companion video units. Below is a structured overview to help advertisers prioritize effectively.

H2: Standard Image Ad Sizes

Static and animated banners remain a core component of display advertising. The following are the key formats still widely supported across publishers in 2025:

• 300×250 (Medium Rectangle) — Versatile, best overall performance on both desktop and mobile.

• 336×280 (Large Rectangle) — Strong in-content visibility and engagement.

• 728×90 (Leaderboard) — High desktop visibility across the top of pages.

• 320×100 (Large Mobile Banner) — Opportunity for stronger mobile CTAs.

• 320×50 (Mobile Leaderboard) — Ubiquitous across mobile inventory.

• 300×600 (Half-Page Ad) — Tall, high-impact option ideal for brand message depth.

• 250×250 / 200×200 (Square Formats) — Flexible placements in compact areas.

• 970×250 (Billboard) — Premium visibility on large screens.

• 468×60 (Standard Banner) — Legacy size still common across mid-tier publishers.

• 160×600 (Wide Skyscraper) — Strong for sidebar visibility and scroll engagement.

These formats dominate the bulk of GDN inventory and provide the most consistent ROI for advertisers who want predictable delivery and performance.

H1: Responsive Display Ad Formats

Responsive Display Ads (RDAs) continue to gain adoption due to their flexibility. Google automatically adjusts RDAs to fit available placements using the following core aspect ratios:

H2: Recommended Dimensions

• Landscape (1.91:1) — 1200×628 px

• Square (1:1) — 1200×1200 px

• Portrait (4:5) — 960×1200 px

RDAs help advertisers maximize reach without manually uploading dozens of variants. However, supplying high-resolution images is essential for maintaining visual clarity across different screen sizes and device types.

H1: Mobile and App-Specific Ad Sizes

Mobile-first design is now the norm. With more than half of global ad impressions served on smartphones, advertisers should prioritize mobile-optimized formats:

• 320×100 (Large Mobile Banner) — Best mobile CTR.

• 320×50 (Mobile Leaderboard) — Most widely supported mobile unit.

• 300×250 (In-App Rectangle) — Effective inside mobile apps.

• 320×480 / 480×320 (Interstitials) — Full-screen ads ideal for high-impact storytelling.

• 414×736 / 736×414 — Optimized for larger phones and hybrid tablet-phone screens.

These formats perform well for app promotion, mobile remarketing, and conversion-driven campaigns where screen real estate matters.

H1: Video Companion and Display-Linked Sizes

For advertisers running YouTube or video-focused campaigns, display companion banners reinforce messaging around the video player:

• 300×250 (Companion Banner)

• 336×280 (Large Rectangle Companion)

• 728×90 (Leaderboard Companion)

• 970×250 (Billboard Companion)

• 300×600 (Tall Companion Format)

These static creatives run alongside in-stream ads, extending brand exposure while users watch video content.

H1: Best Performing Google Display Ad Sizes in 2025

Based on industry benchmarks, platform-wide data, and campaign performance patterns, several formats consistently outperform others in reach and CTR:

H2: 1. 300×250 — The High-Performance Standard

• Highest inventory availability

• Strong CTR

• Works across desktop and mobile

H2: 2. 336×280 — In-Content Powerhouse

• Larger canvas boosts visual clarity

• Best used in articles and editorial placements

H2: 3. 728×90 — Premium Desktop Visibility

• Top-of-page placement improves brand recall

• Ideal for headline-driven offers

H2: 4. 300×600 — High-Viewability Format

• Dominates sidebar area

• Strong for storytelling and product features

H2: 5. 320×100 — Mobile CTR Leader

• Perfect balance between visibility and UX

• High conversion relevance for mobile users

Advertisers who focus on these five formats typically achieve stronger cost efficiency and broader inventory flexibility.

H1: Best Practices for Choosing Display Ad Sizes

To increase viewability and optimize spend, advertisers should follow a strategic mix of formats rather than relying on a single dimension.

H2: Upload Multiple Sizes

Diversifying your creative set ensures that your ads can appear across more publisher placements, maximizing impressions.

H2: Balance Fixed and Responsive Formats

Combine RDAs with standard banners to control visual quality while still benefiting from responsive adaptability.

H2: Prioritize Mobile-First Inventory

Analyze device reports—if more than 60% of impressions come from mobile, prioritize mobile-friendly ad sizes.

H2: Test Creative Variations

Run A/B tests on imagery, color, CTA placement, and headline length. Banner fatigue is real, and creative refresh cycles matter.

H2: Keep File Sizes Light

Google recommends keeping image files below 150 KB. Fast-loading ads improve user experience and Quality Score.

H1: FAQs

H2: Which ad sizes perform best overall?

The top performers are 300×250, 336×280, 728×90, 300×600, and 320×100 due to their widespread inventory support and high CTR.

H2: What is the best size for mobile?

The 320×100 Large Mobile Banner consistently delivers the best results for smartphone traffic.

H2: Should advertisers use responsive ads or fixed sizes?

The best approach is both. Fixed banners allow for brand-controlled design, while RDAs maximize reach across unexpected placements.

H2: What are the required image ratios for responsive ads?

Advertisers should include landscape (1.91:1), square (1:1), and portrait (4:5) for best coverage.

H2: What is the maximum allowed file size?

Image ads must not exceed 150 KB to ensure fast loading and platform compatibility.

H1: Recommended Resources for Google Display Ad Sizes

Google Display Ad Sizes Guide A detailed breakdown of supported banner dimensions and optimization tips for display creatives.

Google Ads Video Specs A complete overview of YouTube and Google Ads video requirements, including formats, lengths, and resolutions.

Rent Google Agency Account

 A high-trust Google Ads agency account solution offering stronger ad stability, lower suspension risk, and flexible billing.