If you have ever had a Google Ad rejected because it was “1 pixel off” or blurred on a retina screen, you know the pain. Getting your web banner sizes right isn’t just about following rules—it’s about maximizing your revenue.
In this guide, we break down the top performing ad sizes for 2026. Plus, we have added direct links to our Free Validator Tools so you can check your files instantly before uploading.
🚀 New: The Master Ad Size Cheat Sheet
Don’t want to scroll? Search 50+ ad sizes for Google, Facebook, Instagram, and more in one place.
The “Big 3” Top Performing IAB Sizes
According to Google AdSense data, these three sizes account for the vast majority of ad inventory on the web. If you only design for a few formats, make it these.
1. The Medium Rectangle (300×250)
This is the workhorse of the internet. It fits in sidebars, inside articles, and on mobile screens. Because it is integrated into content, it typically has the highest Click-Through Rate (CTR).
👉 Tool: Check your 300×250 file here
2. The Leaderboard (728×90)
The first thing users see at the top of a page. It is essential for brand awareness campaigns.
👉 Tool: Check your 728×90 file here
3. The Wide Skyscraper (160×600)
The tall vertical bar that sits in the sidebar. It stays on screen while users read, making it excellent for visibility.
👉 Tool: Check your 160×600 file here
Rising Stars: High-Impact Formats
Want to stand out? These “Rising Star” units are larger and command higher CPMs (Cost Per Mille) because they take up more screen real estate.
- 300 x 600 Half Page: One of the fastest-growing sizes. It offers a massive canvas for visual storytelling.
- 970 x 250 Billboard: A premium unit that sits at the very top of high-authority websites.
- 300 x 1050 Portrait: A massive vertical strip used for cinematic branding.
Pro Tip: Creating these large formats requires high-resolution assets. We recommend using tools like [AFFILIATE LINK: ADOBE / CANVA / ENVATO] to ensure your large banners don’t look pixelated.
Essential Mobile Ad Sizes
With mobile traffic surpassing desktop, these units are non-negotiable.
The Mobile Leaderboard (320×50)
The standard anchor ad found at the bottom of almost every mobile app.
👉 Tool: Validate your 320×50 here
The Mobile Interstitial (320×480)
A full-screen ad that covers the interface, often used in games between levels.
👉 Tool: Validate your 320×480 here
Social Media Dimensions (Quick Reference)
Don’t reuse your web banners on social media! Platforms like Facebook and Instagram compress images differently. Use our dedicated social checkers:
- Facebook: 1080×1080 Feed Validator
- Instagram: 1080×1350 Portrait Validator
- LinkedIn: 1200×627 Sponsored Content Validator
Summary: Design Smart, Validate Always
The days of guessing your ad sizes are over. A single wrong pixel can result in your campaign being rejected by Google Ads or distorted by Facebook.
Bookmark our Master Ad Size Cheat Sheet and use the free tools to ensure your creative is perfect every single time.