Short, practical, and written to be bookmarked — formats, quality settings, and the engineering underneath.
PNG vs JPG explained with real file-size numbers: when each format wins, what happens if you choose wrong, and where WebP replaces both.
WebP is 25–35% smaller than JPG at equal quality — but is it always the right choice? Support tables, real numbers, and the cases where JPG still wins.
What actually happens to your pixels: how lossy and lossless compression work, when discarding data is safe, and the generation-loss trap to avoid.
A clear walkthrough of JPEG-style compression: color space tricks, the DCT, quantization and entropy coding — no math degree required.
WebP, AVIF, JPG, PNG or SVG? A practical decision table for every image role on a website, with fallback strategy and Core Web Vitals context.
The honest version: what “without losing quality” actually means, the settings that are visually lossless, and the four mistakes that cause visible damage.