Reframe any picture to the aspect ratio you need - 9:16, 1:1, 16:9 or 4:5 - by extending the background instead of stretching it, so your subject keeps its proportions and stays properly placed.
How the social media image size resizer works
Upload the image and name the ratio you need, such as 9:16 for a reel or 1:1 for a feed post. The tool extends the background naturally into the new space, matching lighting, grain and perspective, while keeping the subject undistorted and positioned inside the platform's safe area. Rerun for each ratio you need and download the full set.
Tips for the best results
Say which platform and placement, not just the numbers - a story needs room at the top and bottom for interface elements. Images with simple backgrounds extend most convincingly. Say 'keep the subject centred' or 'position the subject low' if the layout matters, and check the extended edges before publishing.