336×280

336×280 is a digital display advertising banner size defined by width 336 pixels and height 280 pixels. It is one of the standard ad units in the IAB (Interactive Advertising Bureau) display advertising guidelines and is commonly referred to as the Large Rectangle.

Used on desktop web pages, the 336×280 unit offers more visual area than smaller banners while remaining a manageable size for many page layouts. It is frequently placed within article content, in the page's sidebar, or as a hero or inline unit depending on the site design.

Creative formats for this size include static images, GIFs, HTML5, and rich media ads. It is typically served as a fixed-size unit, though some ad networks support responsive or scaled versions when used in fluid layouts.

Mobility considerations: On mobile screens, the fixed 336×280 size may be downsized or replaced by other formats to maintain readability and load performance. Publishers sometimes mix it with other sizes in ad inventories to maximize coverage.

Relationship to other standards: 336×280 sits near 300×250 within the family of large and medium rectangle formats; it is part of the IAB's widely adopted set of display advertising sizes alongside other common units such as 728×90 and 160×600.