Images are the single biggest contributor to slow page loads. Getting compression right is the easiest performance win available — but only if you know which format to use where.
Pick the format before you compress
WebP wins for photos (25–35% smaller than equivalent JPG). PNG is for graphics with sharp edges and transparency. JPG remains the safe fallback when WebP support is unclear.
Quality settings that actually matter
Quality 75–82 is the sweet spot for most photos — visually indistinguishable from quality 95, but 40–60% smaller. Quality 90+ is for hero images and product shots where every detail matters.
Resize before you compress
A 4000×3000 photo displayed at 800×600 wastes bandwidth no matter how aggressively you compress. Use the image-resizer to match the actual display size first.