Large Mobile Banner Validator
Check if your image fits the Large Mobile Banner format exactly.
In the fast-paced world of mobile advertising, grabbing attention is a game of pixels. While the standard [320×50 mobile leaderboard] is the most common ad size, it often suffers from “banner blindness”—users have trained themselves to ignore that thin strip at the bottom of their screens.
Enter the 320×100 Large Mobile Banner.
By doubling the height of the standard leaderboard, the 320×100 format offers advertisers a significant advantage: 100% more canvas space to tell their story, showcase their product, and drive clicks.
Let’s explore why the 320×100 is quickly becoming the preferred choice for performance marketers and how you can use it to increase your mobile revenue.
What is the 320×100 Ad Size?
The 320×100 Large Mobile Banner is a smartphone-specific ad unit measuring 320 pixels wide by 100 pixels tall.
Width: 320px (Fits perfectly on almost all smartphone screens)
Height: 100px (Tall enough to display a clear image and text)
Ratio: 3.2:1
It serves as a “middle ground” between the smaller 320×50 leaderboard and the much larger 300×250 medium rectangle (which disrupts content). The 320×100 is small enough to sit at the top or bottom of a page, but large enough to command attention.
320×50 vs. 320×100: Which Should You Choose?
If you are torn between the standard leaderboard and the large banner, consider the following comparison:
| Feature | 320×50 (Standard) | 320×100 (Large Banner) |
| Screen Space | Minimal (Unobtrusive) | Moderate (Noticeable) |
| User Experience | Excellent (Easy to ignore) | Good (Visible but not blocking) |
| CTR Potential | Lower | Higher (More visibility) |
| Creative Freedom | Text only (mostly) | Text + Clear Images |
| Inventory | Extremely High | High |
The Verdict: If you just want cheap impressions, use 320×50. But if you want clicks and conversions, the 320×100 is statistically proven to perform better because it allows for richer graphics and clearer Call-to-Actions (CTAs).
Why the 320×100 is High-Performing
1. It Combats “Fat Finger” Syndrome
One of the biggest issues with the smaller 320×50 ads is accidental clicks. Users trying to scroll often accidentally tap the thin banner. While this increases click numbers, it ruins conversion rates (and annoys users). The 320×100 is tall enough that clicks are usually intentional.
2. Better Visuals
With 100 pixels of height, you can actually include a product shot, a face, or a logo that is legible. You aren’t forced to squeeze your message into a tiny sliver of space.
3. Google AdSense Optimized
Google AdSense and other major ad networks highly recommend this size as a high-performing mobile unit. It fits neatly into the “flow” of content (like between paragraphs) without looking like spam.
Design Tips for a Killer 320×100 Ad
Since you have double the height, use it wisely. Do not just make your text bigger—add value.
The “Two-Column” Structure: Use the left half for your product image and the right half for your headline and button. This structure works perfectly in the 3:1 aspect ratio.
Contrasting Button: Ensure your “Sign Up” or “Shop Now” button is a different color than the background.
Legible Fonts: You can get away with slightly larger font sizes here. Ensure your main value proposition is readable at a glance.
320×100 Validator Tool
Building ads for mobile requires precision. If your file is even one pixel off (e.g., 321×100), ad networks like Google Ads may reject it.
Use the free tool above to check if your image is the exact 320×100 size before you upload it to your campaign.