Instagram Reel size

1080 × 1920 for the video itself. The cover image is the complicated part: it is cropped to 4:5 in the feed and to a square on your profile grid, from the same 9:16 frame.

The double crop on the cover is what people get wrong. You choose a cover from the 9:16 video, but that cover is never shown at 9:16 — the feed shows a 4:5 crop and your profile grid shows a 1:1 crop, both taken from the middle. Any text on the cover therefore has to sit inside the central square to survive both. During playback there is a separate problem: the caption, the like, comment, share and audio buttons all sit over the bottom and right, which is roughly a quarter of the frame gone. Keep faces and subtitles centred and high.