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

Your website’s banner image—often referred to as a hero image, header banner, or slider graphic—is the digital front door of your online presence. It is the very first thing visitors see when they land on your page, making it a critical component for shaping first impressions, communicating your brand value, and driving conversions.

However, even the most stunning, professionally designed banner can fall flat if it is improperly sized. A banner that is too large will sluggishly drag down your page load speed, frustrating impatient visitors and causing them to bounce. Conversely, a banner that is too small or improperly proportioned will stretch, pixelate, or get awkwardly cropped on different screens, making your brand look amateurish.