Instagram square post size (1080×1080)
Quick answer
An Instagram square post is 1080×1080 pixels (1:1). Drop an image in — image cat has this size pre-selected and crops to fit without distortion.
The classic Instagram square post uses 1080×1080 pixels. image cat fills and centre-crops any image to 1080×1080 locally in your browser — no stretching, no letterboxing, and nothing uploaded.
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Why 1080×1080
Instagram displays square posts at 1080 pixels wide and downsizes anything larger. 1080×1080 hits that ceiling exactly — sharp without wasting bytes. The 1:1 ratio is the safest feed format and the least likely to crop out key content.
Crop to fit, no distortion
image cat uses fill-and-centre-crop to cover the full 1080×1080, trimming only the excess edges so faces and products never get squashed. Keep your subject centred for the best result.
Frequently asked questions
A square post is 1080×1080 pixels (1:1) — the most universal feed size, sharp and unlikely to crop key content. For a portrait post, use 1080×1350.
No. image cat fills and centre-crops, trimming only the excess edges, so the subject's proportions stay intact.
No. Cropping runs locally in your browser; your image is never uploaded.
Updated · image cat team