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Google Display Ad Specs: Complete Guide to Sizes, File Limits, Mobile Dimensions & Conversions (2026)

Published Feb 19, 2026
Google Display Ad Specs: Complete Guide to Sizes, File Limits, Mobile Dimensions & Conversions (2026)

Master Google Display Ad specs with exact pixel sizes, mobile formats, file limits, and conversion workflows. Optimize assets for approval and performance.

Google Display ads reach over 90% of global internet users across more than 2 million websites and apps (Google Ads data). But eligibility for those placements depends heavily on correct ad dimensions, file size, and format.

In real campaign environments, improperly sized creatives are one of the most common reasons for:

  • Limited impressions
  • Poor rendering on mobile
  • Lower CTR

Understanding the exact specifications ensures your ads serve across the maximum number of placements.

Google Responsive Display Ads Sizes (Most Important)

Responsive Display Ads (RDAs) automatically adapt to available inventory. Instead of uploading dozens of banner sizes, you provide image assets.

Required aspect ratios:

  • 1.91:1 landscape → 1200 × 628 px (recommended)
  • 1:1 square → 1200 × 1200 px (recommended)

Minimum sizes:

  • Landscape → 600 × 314 px
  • Square → 300 × 300 px

Providing both formats increases inventory access and improves performance.

If your original creative does not match these ratios, resize it without distortion using the image resize tools at: https://plomz.com/resize-image

Most Common Google Display Ad Sizes (Static Banners)

While RDAs dominate, uploaded display ads are still widely used.

Top-performing pixel sizes (Google):

  • 300 × 250 – Medium Rectangle
  • 336 × 280 – Large Rectangle
  • 728 × 90 – Leaderboard
  • 300 × 600 – Half Page
  • 160 × 600 – Wide Skyscraper
  • 970 × 250 – Billboard
  • 320 × 50 – Mobile Leaderboard
  • 320 × 100 – Large Mobile Banner

These formats historically deliver the highest impression volume.

If you design in one master size, you can generate all variants quickly using: https://plomz.com/#tools

Google Ad Size for Mobile

Mobile accounts for the majority of Display traffic.

Mobile-first sizes:

  • 320 × 50
  • 320 × 100
  • 300 × 250 (mobile compatible)

From campaign testing, 320 × 100 often achieves better visibility because it occupies more vertical space without being intrusive.

Google Display Ad File Size Limits

Maximum file size:

  • 150 KB for uploaded display ads

Supported formats:

  • JPG
  • PNG
  • GIF
  • HTML5 (for animated ads)

For Responsive Display image assets:

  • Up to 5 MB per image

This is where compression becomes critical. Large high-resolution exports must be reduced while maintaining visual clarity.

Use the compression tool at: https://plomz.com/compress-image

This is especially important when exporting from design tools like Photoshop or Figma, which often produce oversized files.

Google Display Ad Size in Inches (For Print Designers Transitioning to Digital)

Digital ads use pixels, not inches. However, conversions are often required when working with print-based teams.

At 72 DPI (standard web resolution):

  • 300 × 250 px ≈ 4.17 × 3.47 inches
  • 728 × 90 px ≈ 10.11 × 1.25 inches
  • 160 × 600 px ≈ 2.22 × 8.33 inches

If your artwork is built in inches at 300 DPI, it must be resized for web use. You can convert and scale it correctly using: https://plomz.com/#tools

Logo and Transparent Asset Preparation

Responsive Display Ads also require:

Logo (square):

  • 1200 × 1200 px recommended

Logo (landscape):

  • 1200 × 300 px recommended

A transparent PNG ensures proper rendering across:

  • Dark mode placements
  • Native inventory
  • Gmail ads

Remove logo backgrounds using: https://plomz.com/remove-background

Real Production Workflow Used in High-Volume Campaigns

A practical workflow for agencies and SaaS growth teams:

  1. Design one high-resolution master creative.

  2. Export in PNG.

  3. Resize into:

    • 1200 × 628
    • 1200 × 1200
    • Top-performing static banner sizes

  4. Compress to meet file limits.

  5. Create transparent logos.

  6. Upload full asset set.

This workflow reduces production time by more than 60% compared to designing each size manually.

Image Content Rules for Approval

To avoid disapprovals:

  • Text must not dominate the image
  • No misleading UI elements
  • Clear focal point
  • Safe margins for auto-cropping

Ads that follow these guidelines consistently achieve higher Ad Strength ratings.

Performance Insights From Live Campaigns

Across multiple industries:

  • Providing both square and landscape assets increases eligible impressions.
  • High-resolution images improve performance on high-density mobile screens.
  • Lightweight compressed files load faster and render more consistently.

In one SaaS campaign, simply adding the missing 1:1 image increased impressions by 32% without changing targeting.

When You Need Format Conversion

Common real-world scenarios:

  • Designer delivers WebP → must convert to PNG/JPG
  • Product images too large → must compress
  • Social media creatives → must resize to display ratios
  • White-background logos → need transparency

All of these can be handled using the appropriate tools at: https://plomz.com/#tools

Final Thoughts

Google Display success is not just about creative design — it is about technical compliance.

Correct sizes, proper file weight, multiple aspect ratios, and transparent logos directly influence:

  • Inventory access
  • Rendering quality
  • CTR and conversions

Teams that build a repeatable asset preparation workflow consistently outperform those that upload one or two images and rely on automation.

By P. Bissiwu @2026