App Icon Generator — every size from one image

No. The resizing, the PNG encoding and the ZIP packing all happen locally in your browser with the canvas API. The image never touches a server — you can even load the page, go offline, and it still works.

1024×1024 pixels or larger, ideally PNG or SVG. The generator center-crops non-square images and downscales in halving steps so small sizes stay crisp. Smaller sources work but the App Store icon will be upscaled.

App Store Connect rejects app icons that contain an alpha channel (the classic ITMS-90717 error). The generator composites every iOS icon onto a white background so uploads pass validation; Android and web icons keep their transparency.

Xcode 14 and later can build from a single 1024×1024 icon, so strictly no. But the full set still matters for older Xcode versions, some CI tooling and third-party frameworks — and it costs you nothing here, so the ZIP includes everything with the Contents.json prefilled.

It generates the classic square launcher PNGs plus the Play Store icon. Adaptive icons need separate foreground and background layers with their own safe zones — that's a design decision, not a resize, so it's best done in Android Studio's Image Asset tool with your layered source.