A 9:16 canvas matches the shape of a phone held vertically, so it is a practical starting point for Story graphics and vertical covers. The exported file is still a static image. This tool does not create, edit or encode video.
Platform requirements and previews are not identical. An app may accept a 9:16 image but show a different crop in a profile grid, cover preview or feed placement. Treat 1080x1920 as a high-resolution working canvas, then inspect the final preview in the app where the image will appear.
The safe zone problem every creator hits
A file can fill the 1080x1920 canvas perfectly while the platform's interface still covers part of it. Usernames, captions, navigation and engagement controls can appear at the top, bottom or sides. Their positions can also vary by placement and device.
There is no single cross-platform pixel safe zone. Keep faces, text overlays and calls to action comfortably away from every edge, with extra room around areas likely to hold captions or controls. Let backgrounds extend to the canvas edges, then use the destination app's preview to confirm that essential content remains visible.
Which resize mode to use for different source images
If your source image is already roughly vertical, Fill mode works well. It scales the image up to fill the 1080x1920 canvas and crops anything that extends beyond the edges, centering the crop automatically. For a portrait photo taken on a phone, this usually means a small amount of the top and bottom gets cropped, which is generally fine.
If your source image is horizontal, like a landscape photo or a screenshot from a desktop website, Fill mode will crop heavily and may cut out important parts of the image. In that case, Fit mode is the better choice. It scales the image to fit within the 1080x1920 frame and adds padding to fill the remaining space. The padding defaults to white. If you want a different background color behind your horizontal image in a vertical frame, you'll need an editor with canvas controls rather than a simple resize tool.