How to Compress Images for the Web (Without Ruining Quality)

Compressing images for the web is one of those tasks that sounds trivial until you are staring at a rejected upload, a blurry hero, or a PageSpeed report that insists your LCP image is still too heavy. A sustainable workflow starts with intent: are you optimizing for general performance, or are you trying to slide under an exact kilobyte ceiling for a government portal or job site? Those two goals use the same vocabulary—compression—but they require different tooling discipline. Performance work usually means resizing to the real display width, choosing a modern format like WebP, and avoiding repeated lossy saves. Form-compliance work often means iterative quality tweaks until you land safely below a hard cap without clipping required headroom in the frame. Teams that skip that distinction waste time cranking quality sliders in desktop editors when an automated target workflow would have passed the upload checker in one pass.

This article stub outlines the roadmap we will expand: format selection first, dimension sanity second, and byte targeting last. When WebP is allowed, JPG to WebP and PNG to WebP are usually the fastest wins. When a portal publishes a strict maximum, pair those conversions with compress to 100KB or compress to 200KB so you stop guessing in a desktop editor. Follow-up sections will cover quality checklists, accessibility for alt text, and how to measure before-and-after impact in Lighthouse.