Reels picture-in-picture test: check the four corners first

Trend coverage describes a picture-in-picture (PiP) mode for Reels as in test. I could not confirm from a vendor page where the PiP window sits or how large it is, so this post does not guess. It treats all four corners as possible and shows how to look at each one before you publish.

Four crop windows, one per corner

Sume's video filter takes a crop as fractions of the frame: x, y, width and height, with width and height at least 0.05 and x plus width at most 1. The encode costs $0.02 per job, and the /check endpoint that validates the request is free. A 0.4 by 0.2 window on a 1080x1920 Reel is 432 by 384 pixels.

Cost and what to look for

Run /check on all four first. It costs nothing and catches a width of 0.04 or an x plus width above 1. Then encode the four crops: 4 x $0.02 = $0.08. Look at each crop for a caption, logo or face that a floating window could cover.

Safe zones are a floor, not an answer

Zeely reports Reels safe zones of roughly the top 14 percent (270 px), the bottom 35 percent (670 px) and 6 percent (65 px) on the sides of a 1080x1920 frame. A PiP window is a different overlay from the Reels interface, so treat that zone as a floor, not proof of safety. Keep text and the subject in the middle band and re-check once Instagram documents PiP.