How to Optimize JPEG, PNG, and WebP Images for Core Web Vitals
Practical guide to choosing the right image dimensions, compression quality, and formats to improve Largest Contentful Paint (LCP).
Unoptimized raster images remain the single largest contributor to slow Largest Contentful Paint (LCP) scores on modern websites. By combining proper pixel resizing with modern compression, you can routinely reduce image transfer sizes by 60% to 80% with no perceptible loss in visual fidelity.
1. Resize to Display Dimensions First
Serving a 3000px-wide DSLR photo inside a 720px article column wastes megabytes of bandwidth and decoding memory. Use our Image Resizer with aspect-ratio lock enabled to match your layout's maximum container width.
2. Choose the Optimal Quality Setting
For photographic JPEG and WebP assets, a compression quality setting between 72% and 82% removes high-frequency chroma noise while keeping edges crisp. Test your assets in our Image Compressor to inspect exact byte savings before publishing.