How to Optimize Images for the Web
Images account for 50% of a typical webpage's weight. Optimizing them properly can dramatically improve load times, SEO rankings, and user experience.
Why Image Optimization Matters
53%
of visitors leave if a page takes over 3 seconds to load
50%
of page weight typically comes from images
SEO
Core Web Vitals are now a ranking factor
Step 1: Choose the Right Format
- Photos: Use WebP (fallback to JPG)
- Graphics/Logos: Use WebP (fallback to PNG)
- Icons: Use SVG when possible, otherwise WebP/PNG
- Animations: Use WebP or optimized GIF
Step 2: Resize to Actual Display Size
Never serve a 4000px image that will be displayed at 400px. Resize images to their maximum display size. For responsive images, create multiple sizes and use srcset.
Step 3: Compress Appropriately
Recommended quality settings:
- Hero images: 85-90% quality
- Content images: 75-85% quality
- Thumbnails: 60-75% quality
- Background images: 50-70% quality
Step 4: Use Lazy Loading
Add loading="lazy" to images below the fold. This defers loading until the image is about to enter the viewport.
Quick Checklist
- ✓ Using WebP format (with JPG/PNG fallback)
- ✓ Images resized to display dimensions
- ✓ Compression applied (70-90% quality)
- ✓ Lazy loading for below-fold images
- ✓ Responsive images with srcset
- ✓ Alt text for accessibility and SEO