1024x1024 Image Converter

The best-known case is Apple's App Store icon. Since Xcode 14, a single 1024 × 1024 px image can serve as the source for every icon size on iPhone and iPad, and the same square is what App Store Connect shows on your product page. It must be square, opaque and without rounded corners; the system applies the mask itself.

Image generation is the second big source of 1024 squares. DALL·E 3 renders 1024 × 1024 by default, and Stable Diffusion XL was trained at a 1024 base resolution, so reference images, inpainting inputs and training sets work best at that size. Designers also keep a 1024 master for avatars and emoji and scale it down: Discord, for example, displays emoji far smaller and caps the upload at 256 KB, so you export the small copy from the big one with resize image to 512x512 or lower.

A 1024 × 1024 square holds just over one million pixels. As a PNG, a flat logo is small, while a detailed photo can run to a couple of megabytes; switch Output format to JPG or WebP when a form caps the upload, or tick Limit file size and enter a KB target. Fit inside, the remaining choice, keeps proportions without padding, so a non-square picture comes out smaller than 1024 on one side; it is the wrong choice when the destination checks exact dimensions.

Watch the upscaling. A 640 × 480 phone screenshot cropped to a square is only 480 px across, and stretching that to 1024 px doubles every pixel. Never enlarge prevents it, at the cost of a smaller output. For square crops at other ratios, change aspect ratio and the guide on cropping an image to a ratio cover the rest.