The Ultimate Guide to Website Banner Image Sizes: Dimensions, Best Practices, and Performance

First impressions matter. When a user lands on your website, the top banner—often called the hero image or header banner—is usually the very first thing they see. It sets the tone, communicates your brand value, and dictates whether a visitor stays or bounces.

However, getting website banner dimensions right can feel like navigating a maze. Too large, and your page speed crawls; too small, and your banner looks pixelated and unprofessional on modern high-resolution screens.

Standard Website Banner Sizes

Different types of banners serve different purposes across a website. Here is a quick breakdown of the standard pixel dimensions used by web designers today: