Web Performance: How Image Optimization Improves Core Web Vitals
Images account for 50% of page weight. Here's how image compression directly impacts Google's Core Web Vitals and your search rankings.
The Problem: Slow Images Kill SEO
Google's research shows that a 1-second delay in page load reduces conversions by 7%. Images are the #1 cause of slow Largest Contentful Paint (LCP) β a Core Web Vital that directly affects rankings.Image Format Impact on Page Speed
Step-by-Step: Optimize Images for Web
Common Mistakes
| Format | File Size (photo) | Transparency | Animation | Best For |
|---|---|---|---|---|
| JPEG | Small | No | No | Photographs |
| PNG | Large | Yes | No | Logos, graphics |
| WebP | Smallest | Yes | Yes | Modern browsers (95%+) |
| AVIF | Very small | Yes | Yes | Cutting edge (80%+) |
| SVG | N/A (vector) | Yes | Yes | Icons, logos |
Try it now: Open the Image Tool →
Frequently Asked Questions
How does image compression affect SEO?
Compressed images load faster, improving Largest Contentful Paint (LCP) β one of Google's three Core Web Vitals. Sites with good LCP scores rank higher. A 50% image size reduction can improve LCP by 1-2 seconds.
What's the ideal image file size for web?
Under 100KB for thumbnails, under 300KB for content images, under 500KB for hero images. Use WebP format for 25-35% smaller files than JPEG with the same quality.
Should I compress images before or after uploading?
Before. Server-side compression is good, but pre-compressed images load even faster. Use our browser-based compressor to reduce file size without any quality loss visible to the human eye.