SOCIAL SIZE
☞ runs entirely in your browser — nothing is uploadedDrop your image here
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Crop preview
OneImageTool
Free Image Tools
SOCIAL SIZE
1080 × 1350 — the 4:5 that takes the most room in the feed.
or click to browse — JPG, PNG, WebP
Crop preview
1080 × 1350
A 4:5 portrait at 1080 × 1350 is the tallest a normal feed post can be. That is the reason to use it: on a phone it occupies noticeably more of the screen than a square, and screen space is attention. Anything taller gets cropped back to 4:5 on upload, so 1350 is not a preference, it is a ceiling.
The trade-off is the profile grid, which shows every post as a square and takes that square from the centre. A composition that runs from the very top to the very bottom of the portrait will lose both ends there. The way round it is to frame twice in one crop: fill the 4:5 for the feed, but keep the subject inside the middle square so the grid thumbnail still makes sense on its own.
three steps
PNG, JPG or WebP. It is decoded in the page — nothing is uploaded, so nothing waits on a connection.
The crop box is already locked to the 4:5 shape. Drag it over the part that matters and resize it from any corner; the pixel size is shown as you go.
The export is exactly 1080 × 1350. JPEG for photographs; PNG when the image is flat colour or carries text.
quick answers
4:5 — 1080 × 1350 pixels. Anything taller is cropped back to that shape when you post it, so it is better to choose the crop yourself.
Because the grid crops every post to a centre square. A 4:5 image loses its top and bottom strips there. Keep the subject inside the middle square and both views work.
It takes more vertical space in the feed, which usually helps. Square is the safer pick when the grid matters as much as the feed, since a square post looks identical in both.
No. Everything runs in your browser and the file stays on your device.