How to Optimize Images for 100% Core Web Vitals Score Without Quality Loss

Images Account for 60%+ of Web Page Weight

Unoptimized images are the single biggest cause of slow websites and failing Google Core Web Vitals scores. A single 4MB JPEG uploaded by an editor can destroy your mobile page experience.

Here is how to optimize images systematically for maximum performance.

---

1. Adopt Next-Gen Formats: WebP & AVIF

- WebP: 25% to 35% smaller than JPEG at equivalent visual quality. Supported by 97%+ of all browsers worldwide. - AVIF: Even higher compression efficiency for high-contrast graphics and photos.

Tip: Use the free [Browser Image Compressor](/tools/image-compressor) to convert and compress your images directly in your browser without uploading to any server.

---

2. Preload Above-the-Fold Hero Images

Never lazy-load your hero image. Instead, preload it or assign fetchpriority="high":

---

3. Native Lazy Loading for Below-the-Fold Assets

For all images below the initial viewport, use native browser lazy loading: loading="lazy". This saves significant mobile bandwidth for your users.