What is the 320×320 Mobile Full Page Flex?
The 320 x 320 Mobile Full Page Flex is a modern square ad unit designed specifically for the mobile web. Unlike thin strips, this format takes up a significant portion of the screen as the user scrolls, offering a “social media” feel similar to an Instagram post.
It is increasingly favored by advertisers because it offers a large canvas for video, animation, and high-quality product imagery without being as aggressive as a full-screen interstitial.
Why Use the 320×320 Size?
- High Visibility: Occupies the center of the mobile screen, commanding attention.
- Cross-Platform Friendly: Works perfectly on mobile web and often fits within 300×250 ad slots (flex sizing).
- Rich Media Capable: Large enough to support short video loops or complex animations.
Technical Specifications
- Dimensions: 320 pixels wide by 320 pixels tall.
- File Weight: 150KB – 200KB (depending on network).
- File Formats: JPG, PNG, GIF, HTML5.
Best Practices for Design
Treat this space like a social media post. Use high-quality lifestyle photography or product close-ups. Ensure your logo is visible in the corners and keep your text centered for maximum impact as the user scrolls past.