PhotoResizer

Dimension tool

App Store Icon Resizer 1024×1024

App Store Icon Resizer 1024×1024 resize app icons to the exact 1024×1024 PNG requirements for Apple App Store.

1024 × 1024 px · PNGPrivate on-device processingActual result shown
  1. 1Choose image
  2. 2Adjust
  3. 3Download

Private by design. Your image is processed locally in your browser and is not uploaded to our server.

Purpose

What this tool does

This App Store icon resizer prepares your master application artwork to Apple's strict 1024 × 1024 pixel PNG specifications for iOS, iPadOS, and macOS submissions. It enforces a flat square canvas without alpha channels (preventing Apple Error ITMS-90717) and preserves sharp vector edges. It is preconfigured for 1024 × 1024 pixels. Processing happens entirely on your device — your image is decoded, resized, compressed, and prepared for download without being uploaded to any server.

Output

Supported formats and output

Upload JPG, PNG, or WebP. Choose JPG for broad form compatibility and smaller files, WebP where it is accepted, or PNG when transparency and lossless output matter more than an exact KB target.

The result card reports the actual pixel dimensions, format, and file size rather than assuming the target was reached. You can verify the output before downloading.

Detailed instructions

How to use it

  1. 1

    Choose a local JPG, PNG, or WebP image from your device or camera.

  2. 2

    Review and adjust the dimensions and crop position to frame your subject without stretching.

  3. 3

    Select the output format, tap Prepare Image, verify the result visually, and download it to your device.

Before uploading

Common limitations

Apple rejects icons containing transparency or alpha channels (Error ITMS-90717). Do not manually apply rounded corners or drop shadows; iOS automatically applies its continuous curvature mask. Ensure the canvas is a solid square.

Very large photos can exceed a phone's available memory. If processing fails, try a smaller source image. PNG cannot be compressed by changing quality like JPG or WebP.

Privacy

Private browser processing

Your selected image is decoded, resized, compressed, and downloaded locally in your browser. Normal tool operation does not upload the image or its original filename to our server. The processed result stays on your device until you choose to save or share it.

Practical guidance

Apple App Store icon guidelines and alpha rejection rules

Apple App Store Connect requires every iOS, iPadOS, and macOS submission to include a single 1024 × 1024 pixel master icon. The most frequent cause of automated rejection during binary processing is Error ITMS-90717: 'Invalid Image Asset - The icon file contains an alpha channel.' PhotoResizer strips unnecessary alpha channels and flattens your artwork over an opaque RGB background. Furthermore, designers must avoid manually cutting rounded corners; Apple's Springboard dynamically applies continuous curvature squircles. Need Google Play assets as well? Check our Google Play 512×512 icon tool, App Store screenshot resizer, or visit the comprehensive Developer Asset Hub.

Frequently asked questions

Why does Apple reject app icons with an alpha channel?

Apple App Store Connect requires completely opaque app icons without transparency. If an alpha channel is detected, binary verification fails with Error ITMS-90717. PhotoResizer strips the alpha channel and renders your icon on a solid RGB canvas.

Should I manually round the corners of my 1024x1024 icon?

No. Never apply rounded corners or drop shadows to your App Store icon. Apple's system software automatically applies continuous curvature squircle masking and lighting effects at runtime across iOS and iPadOS.

What color profile does App Store Connect require?

Apple accepts both sRGB and Display P3 wide gamut color profiles. For maximum consistency across all iPhone and iPad generations, sRGB is recommended.

Is my unreleased app icon uploaded to any server?

No. All resizing, stripping of alpha channels, and format conversion occur locally in your browser. Confidential, unannounced app graphics stay 100% on your device.