The Ultimate Guide to Banner Sizes: Dimensions, Types, and Best Practices for Digital Success

Whether you are launching a high-converting digital advertising campaign, designing a striking header for your website, or setting up a booth at a major industry trade show, getting your banner dimensions right is critical. An improperly sized banner will look stretched, pixelated, or worse—get cut off entirely, ruining your brand’s professional look.

To help you navigate the often-confusing world of dimensions, this guide covers everything you need to know about standard banner sizes for digital display ads, website headers, and physical events.

Part 1: Digital Display Advertising (IAB Standard Sizes)

If you are running display ads (through Google Ads, Meta, or programmatic networks), publishers and ad servers rely on standardized sizes established by the Interactive Advertising Bureau (IAB). Using these standard dimensions ensures your ads can run across thousands of different websites without manual resizing issues.