Instagram portrait post size (1080×1350)
Quick answer
The largest Instagram portrait post is 1080×1350 pixels (4:5). image cat pre-selects it and crops to fill more of the screen.
A 4:5 portrait post (1080×1350) takes up the most vertical space in the Instagram feed, making it more eye-catching. image cat crops your image to 1080×1350 locally — no distortion, no white bars, nothing uploaded.
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Why 4:5 portrait
4:5 is the tallest portrait ratio Instagram allows, taking about a third more feed height than a 1:1 square — easier to stop the scroll. It suits portraits, product shots and any vertically composed content.
Composition tips
Portrait cropping trims the left and right edges, so keeping the subject horizontally centred is safest. If your source is landscape, converting to 4:5 may cut a lot off the sides — favour already-vertical source material.
Frequently asked questions
1080×1350 pixels, a 4:5 ratio. It's the tallest post the feed allows — more screen space and more eye-catching than a square.
For more vertical space and standout presence in the feed, use 4:5 (1080×1350). For the most universal format that's least likely to crop content, use 1:1 (1080×1080).
No. Cropping runs entirely in your browser; images are never uploaded.
Source-checked platform specs
Updated · image cat team