Video aspect ratios explained: 9:16, 16:9, 1:1 and 4:5

What 9:16, 16:9, 1:1 and 4:5 mean, which platforms use each, how composition changes with the frame, and how to make one AI video work in several ratios.

October 14, 2026, 4 min read

The short answer

An aspect ratio is the shape of the frame: width compared to height. Use 9:16 vertical for TikTok, Reels and Shorts, 16:9 horizontal for YouTube and websites, 4:5 for feed posts on Instagram and Facebook, and 1:1 square where you want one frame to work almost everywhere.

With AI video, generate in the ratio you will publish in. Cropping a 16:9 render into 9:16 throws away most of the frame and often cuts the subject. A model composing for a vertical frame from the start places the subject, headroom and movement for that shape.

The main ratios

9:16 vertical: full-screen on phones. Short-form platforms and Stories. At 1080p this is a 1080 by 1920 pixel frame.
16:9 horizontal: the standard widescreen frame. YouTube long-form, websites, TVs, presentations. At 1080p this is 1920 by 1080.
4:5 portrait: a tall rectangle that takes up more of a feed than square. Common for Instagram and Facebook feed posts and many feed ads.
1:1 square: works in most feeds and on desktop and mobile. Simple to compose, less immersive than vertical.
Wider cinema ratios: very wide frames used for a film look, often shown inside a 16:9 frame with black bars. Use for style, not for social feeds.

Platform specs change. Check the platform's current page before a big campaign, as of October 2026 and after.

How composition changes with the frame

Vertical frames suit one subject. A person from the waist up, a product standing upright, a tall building. Wide landscapes feel cramped.
Vertical frames favor up-and-down movement: tilts, pedestal moves, things falling or rising. Side-to-side moves cross the frame very quickly.
Horizontal frames suit space and relationships: two people talking, a landscape, a subject moving across the frame.
Square frames reward centered, graphic compositions.
Every ratio has safe zones on social apps: the top and bottom of a vertical video are covered by usernames, captions and buttons. Keep faces, products and text in the central area.

Headroom matters more in vertical. Leave a little space above the head, but not so much that the face drops into the lower half, where captions and the description will sit. For on-screen captions in a vertical video, place them just below the center, between the subject's chin and the app's description text.

Before and after: prompting for the frame

Before: a 9:16 render with the prompt "Wide shot of a couple having a picnic in a big green park with a lake and mountains in the background."

Why it fails: the prompt describes a horizontal picture. In a vertical frame the couple shrinks to a small strip in the middle, the lake and mountains are cut off at the sides, and the top half is empty sky.

After: a 9:16 render with "Vertical frame. Medium shot of a couple sitting on a picnic blanket, framed from slightly above, the blanket and food filling the lower third, the woman laughing in the centre, a tall birch tree rising behind them. Slow tilt up from the food to their faces."

Try this prompt in Create Video

The fixed prompt composes for height. The subject fills the frame, there is a vertical element behind them, and the camera move runs along the long side of the frame.

One video, several ratios

If you need the same piece in more than one ratio, plan for it before you generate.

Option 1, generate each ratio. Render the key shots natively in 9:16 and 16:9 with the same prompt adapted for each frame. Best quality and composition, at the cost of extra renders.
Option 2, protect the center. Compose a 16:9 shot with the important action in the middle third, so a 9:16 crop still holds the subject. Generate at a higher resolution or upscale first so the crop stays sharp.
Option 3, mix. Native vertical for shots with people and faces; cropped versions for wide establishing shots, where a crop does less damage.

In ClickPop, YouTube Shorts and Drama Studio are built around vertical video, Create Video lets you pick the ratio per clip, and models that render at 720p can be upscaled to 1080p or 4K, which helps when you need to crop.

A worked example: one launch, three formats

A sneaker launch needs a 16:9 website hero, a 9:16 Reel and a 4:5 feed ad.

16:9 hero: "Wide shot, a runner in the new sneaker crosses the frame from left to right on an empty coastal road at sunrise, camera trucks alongside." Try it
9:16 Reel: "Vertical frame, low angle close-up of the sneaker striking wet asphalt, camera tilts up to the runner's face, sunrise behind." Try it
4:5 ad: "Portrait frame, the sneaker on a concrete block, slow orbit, clean space at the top for the headline."

Each version is composed for its own frame rather than cut out of one master. The grade and the light stay the same so they read as one campaign.

Mistakes to avoid

Rendering in 16:9 and cropping everything to vertical.
Putting text in the top or bottom of a vertical frame where app buttons cover it.
Letterboxing a horizontal video inside a vertical frame for short-form. It wastes most of the screen.
Changing the ratio mid-video. Keep one ratio per edit.

Questions

What aspect ratio is best for TikTok, Reels and Shorts?

Vertical 9:16, full screen on a phone. Keep faces and text away from the top and bottom, where the app's interface sits. Check each platform's current spec page.

Is 4:5 or 1:1 better for Instagram feed posts?

4:5 takes up more of the screen in a mobile feed, so it is the common choice for feed posts and ads. Square still works and is easier to reuse elsewhere.

Can I crop a 16:9 AI video to 9:16?

You can, but you lose most of the frame and resolution. Compose with the action in the center, generate at a higher resolution or upscale first, or render the vertical version natively.