How to Optimize Images for the Web
Web image optimization is a pipeline: choose the right format, compress to a realistic quality target, and deliver only the pixels users actually need.
Pick the right dimensions first
Resize images to match real display sizes before compression. Sending oversized assets wastes bandwidth and hurts LCP.
Use responsive srcset and sizes so different devices download appropriately sized images.
Tune quality by content type
Photos usually tolerate stronger lossy compression than screenshots, logos, or UI images.
Compare outputs visually and numerically. A smaller file is only useful if perceived quality stays acceptable.
Improve loading behavior
Preload or prioritize above-the-fold hero images, and lazy-load below-the-fold assets.
Keep image payloads aligned with Core Web Vitals goals so pages feel fast on both mobile and desktop networks.