1024 × 1024 Image Converter

Where 1024 × 1024 is actually required

• Default output size for many image-generation models
• The iOS App Store icon, which must be exactly 1024 × 1024
• High-resolution app and PWA icon masters
• Square social posts where you want headroom above 1080

Which format to save it as

PNG without transparency for App Store icons. PNG or JPG for anything else, depending on whether you need alpha.

The thing that usually goes wrong

Submitting an App Store icon with an alpha channel or with the corners already rounded is one of the most common causes of a rejected build.

Crop first, then resize

The order matters more than people expect. Cropping decides what is in the frame and costs nothing in quality — it removes whole pixels rather than degrading the ones you keep. Resizing then scales what is left to the target. Do it the other way round and you resize detail you were about to throw away, which wastes quality on pixels that do not survive.

This is especially true for a square target like many of the sizes here. A landscape photo squeezed into a square loses the sides whatever you do — the only question is whether you choose what goes, or a platform does. Use the image cropper first if the framing matters.

Enlarging does not add detail

Scaling down is safe: the extra pixels genuinely are not needed. Scaling up is interpolation — the new pixels are averaged from their neighbours, which produces a smooth guess rather than recovered detail. It looks acceptable up to about 150% and soft beyond that. When you need a bigger version, go back to the original camera file, the RAW export or the vector source, all of which rasterise cleanly at any size.

Other sizes

• 64 × 64 — small icons and game sprites
• 128 × 128 — application icons and chat emoji
• 256 × 256 — windows icons and store thumbnails
• 300 × 300 — forum avatars and catalogue thumbnails
• 512 × 512 — pwa icons, android adaptive icons and ai model inputs
• 800 × 600 — email attachments and document embedding
• 1000 × 1000 — the amazon listing minimum for zoom
• 1080 × 1080 — the square social post

Need a size that is not listed? The image resizer takes any width and height, and the aspect ratio calculator works out the second dimension when you only know the first.