Web Image Optimization: Comparing WebP, PNG, JPG, and SVG for Performance

Images represent over 60% of total page weight on modern websites. Choosing the right format directly impacts Google Core Web Vitals (specifically Largest Contentful Paint), user bounce rates, and mobile load times.

While legacy formats like PNG and JPEG remain common, modern formats like WebP deliver superior compression ratios with no discernible loss in visual fidelity.

WebP delivers 25% to 35% smaller file sizes than equivalent JPEGs while supporting both lossy and lossless modes, as well as full alpha transparency. With universal support across 98%+ of global browsers, converting banner images and product shots using [Convert Image](/tools/image/convert-image) is a must-have optimization.

PNG remains the gold standard when absolute pixel perfection is required, such as logos, screenshots with sharp UI text, and UI icons with crisp transparent borders.

For photographic content, however, PNG is needlessly heavy—often 5x to 10x larger than an optimized WebP or JPEG.

For icons, logos, and simple illustrations, vector SVG files are infinitely scalable and weigh only a few kilobytes. When you need raster fallbacks for legacy systems, convert them cleanly with [SVG to PNG](/tools/image/svg-to-png).

Platforms enforce specific aspect ratios: 9:16 for TikTok, Instagram Reels, and YouTube Shorts; 1:1 for Instagram square posts; 16:9 for YouTube thumbnails and desktop previews. Elixuvo's [Aspect Ratio Resizer](/tools/image/aspect-ratio-resizer) formats your images to standard dimensions in seconds with custom letterbox or blur padding.