A 256 logo should be enlarged before you talk 1024

The store wants 1024. The chat export is 256.

Stretching it smears. Since 2025-12-21 the preview can 4×. Real-ESRGAN x4plus, on-device, free.

When to press it

Source under 512, and you need iOS 1024 or a large macOS ICNS: enlarge, then size and padding.

Already SVG: upload the SVG so rasterisation happens large. Bitmap still short? Then 4×.

The model is about 64 MB. Cache lives in Settings. Then offline. Shortcut Cmd+U / Ctrl+U. See shortcuts and AI upscale.

Upscale does not fix composition. A muddy photo icon is still muddy at 4×. Replace the source.

Do not

• Do not treat 4× as free matting. Matte is separate and Pro.
• Do not press twice for 16×. Once.
• Do not judge sharpness on a tiny canvas. Canvas size is not export size.

Next: sit it on the canvas, ICO without a halo.