Standard Web Banner Sizes: Complete Guide & Dimensions

Mastering Standard Web Banner Sizes: The Ultimate Designer and Marketer Guide

Whether you are launching a display advertising campaign or designing graphics for a client’s website, choosing the right banner size is critical. In digital marketing, pixel dimensions can make or break a campaign. An improperly sized ad may get automatically cropped, distorted, or rejected entirely by ad networks like Google AdSense or Meta.

This comprehensive guide breaks down the standard web banner sizes, explores where they work best, and shares expert tips to maximize your click-through rates (CTR).

1. The Top-Performing IAB Standard Banner Sizes

The Interactive Advertising Bureau (IAB) sets the baseline standards for digital ad formats to ensure consistency across the web. While hundreds of sizes exist, a few high-performing dimensions drive the vast majority of conversions.

| Ad Name & Common Usage | Dimensions (Pixels) | Best Placement / Context |
| :— | :— | :— |
| Medium Rectangle | $300 times 250$ | Embedded within article content or sidebars. High versatility and inventory. |
| Leaderboard | $728 times 90$ | Traditionally placed at the very top of a website header. Great brand visibility. |
| Large Rectangle | $336 times 280$ | Similar to the medium rectangle, but offers slightly more visual real estate. |
| Half Page (Skyscraper) | $300 times 600$ | Sidebars. Provides massive visual impact and high engagement rates. |
| Mobile Leaderboard | $320 times 50$ | Optimized specifically for mobile phone screens and sticky footers. |

2. Categorizing Banner Sizes by Placement

To design an effective campaign, align your creative assets with where they will actually live on a webpage.

A. Above-the-Fold & Headers

• $728 times 90$ Leaderboard: The classic banner. Because it sits at the top of the page, it gets immediate eyeballs, though banner blindness has made users prone to scrolling past it quickly.
• $970 times 250$ Billboard: A massive, high-impact header format that dominates the top of a page. Best for major product launches and high-budget brand awareness.

B. In-Content & Sidebars

• $300 times 250$ Medium Rectangle: Undisputedly the workhorse of display advertising. Because it sits naturally alongside text or inside sidebars, it blends well with content and yields strong click-through rates.
• $300 times 600$ Half Page Ad: Growing rapidly in popularity, this vertical format gives designers plenty of room to tell a visual story or showcase multiple products.

C. Mobile-First Formats

• $320 times 50$ Mobile Leaderboard: The essential standard for smartphones.
• $320 times 100$ Large Mobile Banner: Offers double the height of the standard mobile leaderboard, doubling your space for CTA buttons and legible text on mobile screens.

3. Best Practices for High-Converting Web Banners

Knowing the dimensions is only half the battle. To turn passive browsers into buyers, keep these design principles in mind:

• Keep it Simple and Clutter-Free: Avoid cramming too much text or imagery into small spaces like a $320 times 50$ banner. Stick to one core message and one striking visual.
• Make the Call-to-Action (CTA) Pop: Use a high-contrast button or text prompt (