The most common size
1080 × 1920, with a 9:16 ratio.
Why full-screen still does not mean fully safe
The top usually holds status elements, and the bottom often holds buttons, avatars, captions, and interaction UI. If the subject sits too close to an edge, the most important part can feel blocked after publishing.
A more reliable approach
- Keep people, products, and text in the central area.
- Leave space at both the top and bottom.
- Always confirm the crop manually instead of relying on a blind auto-crop.