Images account for over 50% of an average webpage's total weight. A 4MB hero image that loads in 8 seconds on mobile is a conversion killer — Google's research shows a 1-second delay reduces conversions by up to 20%.
Lossy vs Lossless Compression
Lossless compression removes metadata without touching pixel values. PNG is always lossless — typical reduction: 10–30%.
Lossy compression permanently discards some pixel data. JPEG, WebP use lossy. Typical reduction: 50–90%.
Optimal Quality Settings
WebP: 25–35% Smaller Than JPG
| Image type | Original JPG | WebP (same quality) | Saving |
|---|---|---|---|
| Portrait photo | 420 KB | 280 KB | 33% |
| Product shot | 185 KB | 125 KB | 32% |
| Landscape | 1.1 MB | 730 KB | 34% |
Safari added full WebP support in 2020. Global browser support is 97%+ in 2025.
How to Check Quality After Compression
Use our Image Compressor and WebP Converter to optimise your images in your browser — no uploads required.