What video format and length works best for social media engagement?

Short vertical videos perform best - the shorter, the better. While 90 seconds is the maximum for Reels, 8-10 second videos often get more views because people rewatch them repeatedly. Always film vertically to take up the full phone screen (horizontal videos get scrolled past). Use 1080p resolution - not too low (pixelated) or too high (overkill). A hack: pair short videos with longer captions because when viewers expand the caption, the video keeps playing, increasing your view count. About 75% of effective content can be filmed simply on your phone without heavy editing.