Reframe horizontal video to vertical 9:16 without losing the shot

To reframe a horizontal 16:9 shot to vertical 9:16, you crop a tall window out of the wide frame and move that window to follow what matters, shot by shot. The window is roughly a third of the original width, so most of the frame goes. The job is deciding what to keep, and keeping the subject, eyes and on-screen text where a phone viewer can actually see them.

Automatic tracking gets you most of the way, but a good vertical cut is still edited, not just cropped. This guide covers the principles that apply in any editor, then shows the workflow in cinemaOS: Finisher ▸ Frame ▸ Reframe with Track Subject, the J.A.R.E.D. "Reframe to 9:16" command, and Export All Aspects for a full set of social sizes.

What you lose, and what to decide first

A 9:16 window cut from a 16:9 frame at the same height keeps about 32% of the width. Two-shots become singles. Wide establishing shots become a slice of sky or floor. Text placed at the edges of the original disappears.

Before touching any tool, decide per scene:

• Who or what carries the shot? One speaker, a product, a hand, a vehicle.
• Does the scene need both people? If a two-shot is essential, consider cutting between singles, or letting the wide play with bars instead of cropping.
• Is the wide shot worth keeping as a wide? Sometimes letterboxing a landscape inside the vertical frame reads better than a crop of nothing.

Framing principles for vertical

Eyes in the upper third. On a tall frame, the natural eye line sits higher than in widescreen. Leave headroom, but not so much that the face drifts to the middle of the screen.

Lead room in the direction of looking or moving. In vertical there is little horizontal room, so offset slightly rather than centring everything. Perfect centring on every shot becomes monotonous.

Respect the platform interface. Social apps place buttons, captions and account names over the bottom and right side of the video. Keep faces, captions and key text out of roughly the bottom fifth and away from the right edge. Each platform publishes its own safe zones and they change, so check current guidance for where you are posting.

Move the window gently. Tracking that follows every twitch looks nervous. Smooth the motion, and let the subject move within the frame a little before the window catches up.

Cut where the crop breaks down. If tracking would need a fast pan to follow two people, an edit between them is usually cleaner.

Re-check graphics. Lower thirds, titles and subtitles designed for 16:9 often need resizing or repositioning. Burnt-in widescreen subtitles are a common casualty.

Mind the pace. A wide shot that breathes in a cinema can feel slow once it is cropped to a single figure on a phone. Some editors trim the vertical cut slightly tighter than the widescreen one, especially in the first seconds. That is an edit decision, so make it deliberately rather than letting the crop make it for you.

A reframe checklist that works in any editor

1. Duplicate your finished sequence, so the master stays untouched.
2. Set the new sequence to 1080×1920 (or 2160×3840 if your source allows it).
3. Go shot by shot. Set position keyframes, or use automatic tracking, to keep the subject in frame.
4. Smooth fast moves; replace impossible ones with cuts.
5. Rebuild or reposition titles and captions inside the safe zones.
6. Check sharpness. Cropping a 1080p source to vertical means scaling up, and soft footage gets softer.
7. Watch the whole thing on a phone, at phone brightness, before you post.

Reframing in cinemaOS

cinemaOS is a Mac editor and finishing app for Apple silicon. Reframing lives in the Finisher, with subject tracking built in.

From HOME. Press ⌘⇧H and pick the Vertical tile ("Social / mobile") to start a vertical deliverable.

Finisher ▸ Frame ▸ Reframe. Switch to the Finisher (⌘2), choose the Frame outcome, then the Reframe chip. Pick the target aspect, for example 9:16, and use Track Subject to follow the person or object you select. Where the crop does not work, switch that shot to bars or crop manually. The tracking runs on your Mac.

Ask J.A.R.E.D. In the Finisher, press ⌘J and type "Reframe to 9:16". The command runs through the Finisher's own undo stack, so ⌘Z reverses it if you do not like the result. Then refine individual shots by hand. J.A.R.E.D. works best with English requests today.

Captions after reframing. If you need subtitles on the vertical version, make them in Finisher ▸ Localize ▸ Captions after the reframe, and place them clear of the platform interface. Burn In is there when a platform will not take a sidecar file.

Covering faces. For street footage or documentary work, Finisher ▸ Fix ▸ Cover can blur, bar or pixelate faces with tracking. See blurring faces in video on a Mac.

Export every aspect from one edit

A release rarely needs only 9:16. Trailers and teasers usually go out as 16:9, 1:1, 4:5 and 9:16.

In the Atelier (⌘3), Export All Aspects (⌘⌥E) produces the set of sizes from one piece of work. Combine it with Adapt sizes in Layout for graphics and key art, and with a brand kit so titles and colours stay consistent. Our guide to a brand kit for every aspect ratio walks through that side.

Masters render as ProRes or H.264 and HEVC, and an export never overwrites an earlier file; a second render becomes "Name 2".

FAQ

Should I shoot vertical instead?

If vertical is the main destination, shooting for it, or shooting wider with room to crop, gives better results than reframing. For a film primarily made for the screen, reframing the trailer is usually the right compromise.

What resolution should a 9:16 export be?

1080×1920 is the common baseline for social platforms. Check each platform's current upload recommendations.

Can automatic tracking handle a whole film?

It can do a first pass on every shot, but plan to review each one. Tracking is a starting point, not a final framing decision.

Reframe one trailer first

Take your current trailer, reframe it to 9:16 with the checklist above, and watch it on a phone. If you want subject tracking and every social aspect in one place, try it in cinemaOS. The 60-day free trial needs no card.