Make Interviews Look Better: Lighting and Framing a Seated Interview That Will Crop to Vertical
Interviews are among the most reframed videos online. A few choices on set make the vertical version look intentional instead of improvised.

Quick answer: to shoot an interview that crops well to vertical, frame the subject in a medium wide shot with space around them, light the face with a soft key from the side the subject faces, keep the background interesting but not busy, and record in 4K so a 9:16 crop stays sharp.
Interview footage gets cut into many vertical clips. Planning for that on set saves time in the edit and gives a better picture.
Framing on set
Shoot slightly wider than usual. A medium wide frame gives the vertical window room for gestures and leans.
Offset the subject but not to the edge. Classic interview framing places the subject on a third. Keep their hands inside the wide frame, because gestures read well in vertical.
Watch the eye line. The subject looks toward the interviewer, slightly off camera. Vertical crops need look room on that side.
Lighting that survives the crop
A soft key light on the side the subject faces, a gentle fill and a touch of backlight work for both wide and vertical. Practical lights in the background add depth, but keep them away from directly behind the head, where the vertical frame will put them.
Background choices
In vertical, the background behind and above the subject becomes more visible. Plants, shelves and warm lamps work. Avoid strong vertical lines growing out of the subject's head.
In the edit
Place the vertical frame on the speaker and leave it steady. Add a keyframe only when they shift. Slow, smooth movement keeps the clip calm.
From one interview to a week of clips
Cropper on phone and tablet is ready for quick social cuts from your interview selects.