Images in mobile apps directly affect app performance, battery usage, and user experience. Oversized images cause slow loading, high memory usage, and poor performance on older devices. Here is how to compress images correctly for mobile apps.
Why Mobile Image Optimisation Matters
- Mobile data is expensive — large images frustrate users on limited data plans
- Slow image loading increases app abandonment rates
- High memory usage causes app crashes on older or budget devices
- App Store size limits make every kilobyte count for bundled assets
- Google Play rewards smaller apps with better placement in search results
Mobile App Image Size Guidelines
| Usage | Max Dimensions | Target File Size |
|---|---|---|
| App icon | 1024×1024 px | Under 100 KB |
| In-app photo | 1080×1920 px | Under 300 KB |
| Thumbnail | 200×200 px | Under 20 KB |
| Background | 1080×1920 px | Under 500 KB |
Compressing Images for Mobile Apps
Upload your image to imgresizr.com. Resize to the maximum display dimensions on the target device — for full-screen images on modern phones, 1080×1920px. Use the Compress tool at 80% JPG quality for photos or lossless compression for PNG icons. For app icons, use PNG compressed with the lossless tool. Target file sizes from the table above.
Best Formats for Mobile
- WebP: Best overall — 30% smaller than JPG with same quality, supported by all modern iOS and Android versions
- JPG: Best for photos when WebP is not available
- PNG: Best for icons, logos, and transparent UI elements
- SVG: Best for simple icons — scales to any screen density with no file size increase
Compress all mobile app images at imgresizr.com before including them in your project — free, fast, and no software installation required.