Icon Resizer
Resize icons for various purposes, such as favicons and app icons.
Resize App Icons for iOS & Android: Generate Complete App Store & PWA Icon Sets
You spend weeks designing, coding, and testing your mobile application. You create a gorgeous master 1024x1024 app icon and prepare to submit your build to the Apple App Store and Google Play Console.
Then Xcode or Android Studio rejects your project archive with a wall of error warnings: "Missing required icon sizes: 20pt, 29pt, 40pt, 60pt @2x and @3x... Missing mipmap-xxxhdpi resource."
Opening Photoshop and manually cropping, resizing, and renaming thirty different square PNG files is mind-numbing busywork that eats up hours of developer time.
Our free online Icon Resizer automates this entire pipeline. Upload your single master 1024x1024 icon graphic and instantly generate a complete, ready-to-drop asset package containing every exact resolution required by Apple iOS, iPadOS, watchOS, macOS, Android mipmap densities, and modern Progressive Web Apps (PWAs).
Standard Platform Icon Specifications
| Platform / Context | Required Sizes (Pixels) | Special Platform Rules |
|---|---|---|
| Apple App Store Master | 1024 x 1024 | Must be solid (NO transparency allowed) |
| iPhone Home Screen | 120 x 120 (@2x), 180 x 180 (@3x) | iOS automatically applies rounded corner squircle mask |
| iPad Home Screen | 152 x 152 (@2x), 167 x 167 (Pro) | Scaled for high-density Retina tablets |
| Google Play Store Master | 512 x 512 | 32-bit PNG with alpha transparency supported |
| Android Densities (mdpi → xxxhdpi) | 48x48, 72x72, 96x96, 144x144, 192x192 | Saved inside distinct res/mipmap/ subfolders |
3 Golden Rules for Designing App Icons That Stand Out
1. Never Pre-Round Your Icon Corners
A classic rookie mistake is adding rounded corners to your master image. Both iOS and Android apply their own proprietary continuous-curvature masks (squircles) dynamically. If you pre-round your image, ugly black or white wedge artifacts will appear in the corners on user devices.
2. Keep It Symbolic and Scalable
Remember that your icon will be viewed at 29x29 pixels inside iPhone Settings and notification trays. Complex photographs, lengthy taglines, or multiple small objects turn into an unreadable smudge at notification sizes. Use a single bold emblem or lettermark.
3. Test Against Diverse Wallpapers
Users set pure black, pure white, neon, and busy family photo wallpapers on their home screens. Make sure your icon has enough internal contrast to remain visible against both dark and light mobile backgrounds.
Frequently Asked Questions
What file format should my master icon be?
We recommend uploading a high-resolution 1024x1024 PNG or JPG image. Starting with a large, crisp square master file ensures that downscaling to smaller dimensions (like 16x16 or 48x48) retains sharp linework and vivid colors.
Does this tool generate the Contents.json file for Xcode?
Yes! When you select the "Apple Xcode Asset Catalog" option, your zip package includes the properly formatted Contents.json manifest file so you can drag the entire folder straight into Xcode's Assets.xcassets without manually binding sizes.
Is there any charge or subscription required?
Zero charge. The tool is 100% free with unlimited generation and no watermarks, built to empower indie developers and software teams worldwide.