Resize an image to 1080x1350 for an Instagram portrait post
A portrait post takes up more screen than a square, so it stops the scroll. The catch is that Instagram only allows so much height, and 1080x1350 is the tallest it shows in full. The tool is set to that size already.
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The 4:5 portrait ratio and why it wins space
1080x1350 is a 4:5 aspect ratio, the tallest vertical that Instagram displays in the feed without cropping. It fills roughly 25 percent more vertical screen than a 1:1 square on a phone.
That extra height is the whole point. Use the resize tool, pre-set to 1080 by 1350, so your post claims the maximum feed real estate.
Keep the subject inside the tall frame
Going from a square or landscape source to 4:5 adds height, so a wide photo may lose its left and right edges. Plan for the center column to survive the crop.
Faces and product shots read best when they sit in the upper two thirds of a portrait frame, since profile names and captions stack near the bottom on screen.
Make it light enough to share
A taller image holds more pixels than a square, so the file can be a touch heavier. If you need it small for a slow connection, convert it to WebP for a smaller file at the same quality.
Resizing happens locally in your browser. Nothing is uploaded, so a draft you are not ready to publish stays on your device.