App Icon Generator
Generate all required icon sizes for Web/PWA, iOS, Android, and desktop. Download as a ZIP.
Drop source image or click to browse
Use 1024×1024 PNG for best results
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Platforms
5 files total
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Web / PWA
Create App Icons for iOS, Android, PWA and Desktop in One Click
Publishing an app means supplying dozens of icon sizes: the App Store wants a 1024×1024 master plus sizes down to 20pt, Google Play needs 512×512 for the store listing and six mipmap densities for the device, and PWA manifests expect at least 192px and 512px. Doing this by hand in Photoshop or GIMP means repeating the same export dozens of times. AlteredIdea's App Icon Generator does it in one click.
Upload a single high-resolution image, configure the appearance, and the tool renders every required size in-browser using the HTML Canvas API. Results are packaged as a ZIP you can drop straight into Xcode, Android Studio, or your web root. Because everything runs locally there is no wait for a server, no queue, and no privacy risk: your artwork stays on your device.
How to use: step by step
- 1Upload your source image
Drop or click to select any image. A 1024×1024 PNG gives the sharpest results across all platforms. - 2Pick a background color
Use the color picker or type a hex value. Preset swatches cover the most common choices. - 3Adjust corner radius and padding
Drag the sliders or click a preset (Square, iOS, Android, Circle) to match your design language. - 4Select target platforms
Check iOS, Android, Web/PWA or desktop: or click 'Select all'. The file count updates in real time. - 5Download your ZIP
Click 'Download ZIP' and all icons are generated in-browser and saved as a ready-to-use archive.
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Frequently Asked Questions
- What image size should I use as the source?
- A 1024×1024 square PNG is ideal. The tool scales it down to every required size using high-quality canvas resampling, so starting large preserves detail at small sizes like 16px.
- Which platforms are supported?
- Web/PWA (favicon 16–512, Apple touch icon 180), iOS (all Xcode asset catalog sizes from 40×40 to 1024×1024), Android (mipmap-mdpi through mipmap-xxxhdpi plus Play Store 512×512), and macOS/Windows (16×16 to 1024×1024).
- Do my images get uploaded to a server?
- No. Every operation happens inside your browser using the Canvas API. Your source image never leaves your device.
- Can I use a non-square source image?
- Yes. The tool centers and scales your image within the square canvas. Use the padding slider to add breathing room around non-square artwork.
- What format are the icons saved in?
- All icons are exported as PNG, which is required by the App Store, Google Play, and PWA manifests. They are bundled inside a ZIP file organised by platform and label.
- How does the corner radius work?
- The radius is expressed as a percentage of half the icon width. 0% gives sharp square corners, 22% matches the iOS squircle, 50% produces a perfect circle.
- Can I generate icons for just one platform?
- Yes. Uncheck all platforms and check only the one you need. The 'Select all' button re-enables every platform at once.
- Is the tool free to use without limits?
- Completely free, no sign-up needed, and no limit on how many times you can generate. All processing runs locally so there is no server cost passed on to you.
AlteredIdea vs alternatives
vs AppIcon.co / MakeAppIcon: Those services upload your artwork to their servers to resize it. AlteredIdea processes everything locally in your browser: your source image is never transmitted anywhere.
vs Photoshop / Sketch export presets: No software to install, no license to buy. Open AlteredIdea in any browser, upload, configure, and download in under a minute.
vs paid icon generators: Completely free with no subscription, no watermark, and no monthly export limit. All 30+ platform sizes are available on every run.