Multiple aspect ratios in After Effects with AI
Yes, you can build multiple aspect ratios in After Effects with AI: ask ChatGPT, Claude or any MCP client connected to Prism, and your 16:9 master becomes 9:16, 1:1 and 4:5 comps with the layout rebuilt for each frame.
Every answer that ranks for this is a template pack, a script that makes empty comps at seven sizes, or Fit to Comp, and each one scales the content by a factor. The layout is the work, and it is a decision per layer. That is what you describe.
What you say, and what lands
| You type | What appears in your project |
|---|---|
| "Duplicate Hero_16x9 as Hero_9x16 at 1080×1920. Background fills the frame, logo stays at 8% of comp height, stack the two text layers and keep line width under 80% of comp width. Keep all keyframes and expressions." | A new 1080×1920 comp; background re-anchored to fill, logo rescaled, headline and subline stacked and resized, every keyframe and expression still there |
| "Shrink this 1580×1580 comp and everything inside it to 1080×1080." | Comp resized, every layer scaled and repositioned about the centre, keyframed positions moved with them |
| "Add a 1080×1350 version for the Instagram feed, and in that one move the logo to the top." | A fourth comp laid out for 4:5, the logo change made in that comp only |
| "Make the vertical version a deep duplicate; I need to change the precomp text in it." | The nested precomps copied as well, so the copy no longer shares them with the master |
Test it on your own project. A Free account is enough to start: Sign up, then connect your AI and ask for this.
How to do it
Squashing a comp, and rebuilding for the frame
| Fit to Comp | Rebuilt for the frame | |
|---|---|---|
| Text | Same wrap, now too wide or clipped | Re-wrapped and resized for the new width |
| Spacing | Scaled proportionally, so it reads tight or empty | Re-flowed from the measured bounds of each layer |
| Layer positions | Multiplied by one factor | Laid out again for the new frame |
| Animation | Distances now wrong | Keyframes rebuilt against the new positions |
The four frames
| Frame | Size | What usually changes |
|---|---|---|
| 16:9 | 1920×1080 | the master |
| 9:16 | 1080×1920 | text stacks, logo moves to top or bottom, background fills |
| 1:1 | 1080×1080 | side-by-side becomes stacked, margins tighten |
| 4:5 | 1080×1350 | the 1:1 layout with more headroom |
Auto-Reframe is not this
Premiere Pro's Auto Reframe reframes footage by tracking the subject. It cannot re-lay-out a composition: text keeps its old wrap, spacing keeps its old proportions, and a headline built for 1920 wide is not a headline built for 1080 tall.
What it needs
| After Effects | 2024, 2025 or 2026, macOS or Windows |
| AI client | any MCP client: ChatGPT, Claude, Claude Code, Cursor, Codex and others |
| Plan | a Free account is enough; comp duplication and layout use MCP actions, not the Prism AI balance |
What it does not do
It does not track a subject in footage, and it does not guess a layout you have not described. Nested precomps stay shared unless you ask for a deep duplicate. Every change is undoable in After Effects as usual.
Common questions
Yes. Ask for the 9:16 version with the layout rebuilt, and each layer is repositioned and resized for the tall frame rather than cropped or squeezed.
It keeps the keyframes but scales every distance by one factor, so moves read wrong. Prism rebuilds them against the new positions instead.
Give a rule, such as line width under 80% of comp width or a minimum point size. The text is re-wrapped and resized to meet it.
The copies are separate comps. Precomps nested inside them are shared with the master, as in any duplicate, unless you ask for a deep duplicate.
Yes. Any size works: 1080×1350 for the Instagram feed, or a custom frame you name.
Ask for a 1920×1080 and a 1080×1920 version with the layout rebuilt; both land as new comps beside the square one.
Related
Figma and SVG
Figma and SVG to After Effects with AI: export the frame as SVG, import it as shape layers with live, typeable text, then animate it by describing the motion.
Replace text
Replace text across compositions in After Effects with AI: say what to find, what to put in its place and which comps to skip, and every text layer is rewritten.