Auto-reframe

One horizontal edit, four deliverables. Composition ▸ Auto-Reframe to… retargets a composition to another aspect ratio — 9:16, 1:1, 4:5, 16:9, 4:3 — with the frame following the subject and cutting cleanly at shot changes. You can also just type the aspect into the command palette.

What you get

A new composition at the target size. It holds your original as a comp instance, scaled to cover, with the pan keyframed onto it. Three things about that shape matter:

• The original is never touched. Reframing cannot damage your edit.
• The cuts stay live. Because the vertical version contains the original as an instance, fixing a typo in the 16:9 master fixes it in the 9:16, 1:1 and 4:5 cuts too.
• No fake resolution. The target keeps your footage’s shorter edge — a 1920×1080 master becomes 1080×1920 vertical, not an upscaled 2160×3840.

How it follows the subject

The composition is analysed as a whole — titles, graphics and effects included, so a reframe never crops off your own lower third. The frame then moves like an operator, not like a machine:

1. It has slop. The frame does not chase every wobble; it moves only when the subject has drifted meaningfully off centre.
2. It eases. When it does move, it glides over about half a second rather than snapping.
3. Cuts are walls. At a shot change the frame jumps to the new subject instantly. Sliding across a cut is the one artefact everyone notices, and it never does it.

Empty frames — dips to black, flat graphics — are recognised and do not move the frame at all.

From the command line

premation reframe project.motion --aspect 9:16 produces the same result headless — useful for turning one master into every platform cut in CI. See the CLI.