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Instagram accepts three post shapes, and most people default to the square without realising they are giving away about a quarter of the screen. The three are not interchangeable — they occupy different amounts of a scrolling feed, and that difference is the single biggest lever you have over whether a post gets looked at.
All three share the same 1080-pixel width, because that is what the feed renders at. Uploading wider does not help; uploading narrower does hurt.
A feed is a vertical column. A post competes for height, and 4:5 is 25% taller than a square at the same width. On a phone screen that is the difference between a post occupying most of the visible area and sharing it with the one below.
There is no penalty for using it. 4:5 is a supported, first-class shape — it is simply less used, because the square is what people remember from the app’s early years.
Landscape is the opposite case. At 1.91:1 a post is a strip, easy to scroll past before it registers. Use it when the content is genuinely horizontal — a panorama, a wide product shot — and not out of habit because the photo came out of a camera that way.
Here is the catch that undermines many 4:5 posts. The feed shows your post at 4:5, but the profile grid shows a square crop taken from the middle. A portrait image loses its top and bottom in the grid.
So a tall composition that puts a headline at the very top and a logo at the very bottom looks right in the feed and loses both in the grid. The working rule: compose for 4:5, but keep anything essential inside the central square of that frame. The top and bottom 12.5% are feed-only territory — good for atmosphere, bad for information.
A carousel takes its aspect ratio from the first image and applies it to all the others. If the first slide is square and the fourth is portrait, the fourth gets cropped to a square — it does not get its own shape.
This produces the classic broken carousel: slide one looks deliberate, slides two through five have their tops and bottoms sliced off. The fix is simple and has to happen before uploading — crop every slide to the same ratio, and decide that ratio by what the set as a whole needs, not by what the first photo happens to be.
If the slides are a mixture of orientations, 4:5 with padding is usually the honest compromise: every image survives, and the set stays visually consistent.
Instagram re-compresses everything on upload, which means your export settings matter less than people assume — but not zero.
Use JPG at quality 85–90 for photographs. Exporting at quality 100 produces a huge file that gets recompressed anyway; exporting at 60 means your compression damage and Instagram’s stack on top of each other.
Use PNG when the image contains text, flat colour or a logo. Instagram’s recompression is hard on sharp edges, and starting from a PNG gives it clean input to work from.
Keep the longest edge at 1080 and the file somewhere under a couple of megabytes. Uploading a 20 MB export does not improve the result; it just takes longer.
These are a different system entirely: 1080 × 1920 px (9:16), full screen, with interface elements over the top and bottom. A feed post cannot simply be reused as a Story without either cropping heavily or sitting in a band with empty space above and below.