9:16 vs 4:5 vs 1:1 video: which ratio for which feed?

Three shapes, three ways of sharing a screen

Aspect ratio is width compared with height. A 9:16 frame at 1080 by 1920 pixels matches an upright phone, so the video becomes the screen and the app draws its own controls on top of it. A 4:5 frame at 1080 by 1350 is a quarter taller than it is wide, so in a scrolling feed it fills most of the visible area while leaving the account name, the caption and the next post partly in view. A 1:1 square at 1080 by 1080 fills the width of the phone and less than half of a modern screen's height. None of the three is better in general. Each fits a different kind of placement: full screen viewing, feed viewing, and places where you cannot be sure which will happen.

How placements specify and adapt

Each placement specifies a shape and adapts the others. Meta specifies Facebook Feed video at 4:5, 1440 by 1800, and Reels ads at 9:16, 1440 by 2560. LinkedIn accepts all three plus 16:9, at up to 1080 by 1920 for 9:16, 1080 by 1350 for 4:5 and 1920 by 1920 for square, and a 9:16 video renders vertically only on mobile. TikTok's creative guidance for performance ads is to orient vertically at 9:16 and shoot at least 720p. YouTube treats uploads that are square or narrower and 3 minutes or shorter as Shorts. When a video does not match the placement, the app crops it, adds bars or blurs a copy of it behind the frame, and none of those choices is yours to make.

When the choice matters

It matters most when one file is headed for several placements. A 9:16 video shown in a 4:5 slot loses about 15 percent of its height at the top and another 15 percent at the bottom, which are exactly the bands where people like to place headlines, prices and calls to action. A 4:5 video in a full screen placement sits in a box with empty space around it and looks borrowed from somewhere else. A square travels between placements with the least damage, which is why teams often use it for campaigns spread across many slots, but it gives up screen area in both feeds and full screen views. If most of the budget or the audience lives in one placement, build for that shape first and accept an adapted version elsewhere.

Common mistakes

Designing in 9:16 and assuming a 4:5 crop will keep everything is the first; it only works if nothing important sits in the top or bottom 15 percent. The second is uploading a 16:9 video into vertical placements and relying on the platform's bars, which hands most of the screen to empty space. The third is choosing a shape by trend rather than by where the spend actually goes. The fourth is ignoring text size, since a headline sized for a tall full screen frame looks small when the same video is shown as a feed tile. The fifth is exporting at a low resolution to save time. TikTok's own floor for performance ads is 720p, and a soft video looks worse the more of the screen it fills.

Where it shows up in the product

The video builder here offers two shapes: landscape at 1920 by 1080 and vertical at 1080 by 1920. A square 1080 by 1080 canvas exists in the engine but is hidden from both the generator and the builder, and there is no 4:5 canvas, so a 4:5 feed specification cannot be matched exactly. The format applies to the whole video. For a feed that wants 4:5, the practical route is the vertical cut with the offer, the name and any logo kept well inside the middle of the frame. One detail to check: captions sit 120 pixels above the bottom edge of the vertical frame, which falls inside the strip a centred 4:5 crop removes, so preview any cropped feed version before it runs.

Questions people ask