Pillarboxen

Pillarboxen refers to the practice of displaying a video or film image with black bars on the sides, typically to maintain the original aspect ratio of the content while presenting it on a screen with a different aspect ratio. The term originates from the appearance of the black bars resembling the vertical supports ("pillars") of a box, hence "pillarbox."

This technique is commonly used when broadcasting widescreen content on standard 4:3 aspect ratio televisions or vice versa. For example, a film shot in anamorphic widescreen (such as 2.39:1) may be displayed with black bars on the sides when viewed on a 4:3 screen, preserving the original composition. Conversely, a 4:3 video may appear with black bars on the top and bottom when played on a widescreen display, a method sometimes called "letterboxing."

Pillarboxing is distinct from letterboxing in that it only adds black bars horizontally, rather than vertically. The choice between the two depends on the original aspect ratio of the content and the display being used. While pillarboxing can sometimes result in cropping of the original image, it ensures that viewers see the full width of the content, albeit with some black space on the sides.

The practice is widely used in broadcasting, streaming services, and home video formats to accommodate varying display standards. Modern displays often support multiple aspect ratios, reducing the need for pillarboxing or letterboxing, but it remains a common method for maintaining compatibility with older or non-native formats.