Vertical cartoon video: composing for a tall frame

Generate vertical, never crop to it

When you choose 9:16 before generating, the model composes for that frame: the subject is placed for a tall canvas, the action reads vertically, and the background fills the height.

Crop a 16:9 clip instead and you get the opposite — a character half out of frame, the interesting part removed, and dead space where the composition used to be. It is immediately visible and it is the most common tell of repurposed content.

The aspect-ratio trap

This catches almost everyone once. Supplying a source image or video overrides your ratio selection. For photo-to-video, first-and-last-frame, extend and edit modes, the output inherits the shape of the file you uploaded — the model preserves your asset's proportions and there is no way to override it in those modes.

So if you want vertical output from a photograph, crop the photograph to 9:16 before uploading. Selecting 9:16 in the interface will not do it for you.

Text-to-video is the only mode with genuinely free choice of aspect ratio, which is a good reason to start there when the format matters.

Composing for a tall frame

Three habits, all promptable:

Centre the subject. Ask for centred composition, subject fills the middle of the frame. Rule-of-thirds placement borrowed from horizontal framing puts things where interface elements sit.

Leave breathing room top and bottom. Roughly the top tenth carries the profile and sound ticker; the bottom fifth carries captions, handle and music. Ask for empty space at top and bottom.

Stay clear of the right edge. The action rail — likes, comments, share — covers it on every major platform.

The practical target is keeping everything that matters inside the middle 60% of the height and away from the right-hand strip.

Use the height

Vertical is not just a narrower horizontal frame; it is a taller one, and the good vertical cartoons use that. Things falling, growing, climbing, stacking and towering all read better vertically than they ever did in widescreen.

Prompt ideas that exploit it: a rocket lifting off, a plant growing, a character climbing a step, a stack of coins rising, rain falling past a window, a whale rising through clouds. Vertical motion in a vertical frame feels designed rather than accommodated.

Which ratio for which platform

Choose before generating in every case. Generate a vertical clip in the cartoon video creator, and read the platform-specific craft in our guide to short-form cartoon videos.