What are you posting this on? (e.g., TikTok, a custom app, or a digital sign?)
On modern phones, 1080 x 1920 leaves small black bars at the top and bottom. 2340 covers the entire glass. full hd video 1080 x 2340
. These are the most compatible formats for mobile playback and social platforms. If you are using standard footage in a project, you will need to Scale to Fill What are you posting this on