Which aspect ratio is considered 'fullscreen vertical'?

The aspect ratio that is considered 'fullscreen vertical' is 9:16. This format is specifically designed for mobile devices, where the height is greater than the width. The 9:16 ratio aligns perfectly with how users typically hold their smartphones, allowing for a more immersive and engaging viewing experience, particularly for video content on platforms like Instagram Stories, TikTok, and Snapchat.

This vertical orientation maximizes the screen space on mobile devices, enabling advertisers and content creators to capture users' attention effectively as they scroll through their feeds. The fullscreen vertical format has become increasingly popular due to the rise of mobile-first content consumption, where users interact with content predominantly on their smartphones.

Other aspect ratios, like 4:5 and 1:1, are used for different purposes, such as square and slightly taller-than-wide images respectively, while 16:9 is typically used for horizontal video formats, which do not cater to the mobile vertical viewing trend as effectively as 9:16. Therefore, 9:16 is distinctively recognized as the standard for fullscreen vertical content.