Instagram feed posts: portrait 1080×1350 (4:5) takes the most screen. Square is 1080×1080; landscape 1080×566. This tool outputs portrait — if you're resizing deliberately, take the space. Drop an image; it returns at exactly 1080×1350, cropped to cover, with the slider choosing what survives.
Why exact pixels matter here: Instagram re-compresses every upload. Odd dimensions get scaled and compressed — two quality hits. Arriving at exactly 1080 wide keeps it to one pass. For the same reason, don't pre-compress: this tool encodes at high quality and lets Instagram do its single pass.
Composition:
- Subjects in the upper two-thirds — feeds scroll fast; high placement reads in the half-second available.
- Avoid busy, dark bottoms — the likes/caption UI sits directly beneath the image in feed.
- Reusing the image as a story? Stories are 9:16 — a much taller shape Instagram will centre-crop blindly. The story resizer below crops it deliberately instead.
Drop several candidates, compare at output size, post the winner. Cropping and encoding run inside this page on your device — nothing is transmitted, and the only upload is yours, to Instagram.