Image Optimization for Core Web Vitals: WebP, AVIF, and Compression
Oversized hero PNGs are the number one cause of slow Largest Contentful Paint. Here is a practical format matrix for modern web apps.
Choosing Between WebP, JPEG, and PNG
Lossy WebP typically delivers 25% to 35% smaller payloads than equivalent JPEGs at identical visual SSIM scores, while supporting alpha transparency for UI graphics.
Convert legacy screenshots and product photos using our Image Converter and dial in quality between 75% and 85% in the Image Compressor.
Preventing Cumulative Layout Shift (CLS)
Always declare explicit width and height attributes or CSS aspect-ratio boxes on every image container so the browser reserves geometry before bytes finish decoding.
Tools Mentioned in This Guide
Image Compressor
Shrink JPG, PNG, and WebP file sizes locally with live quality control, optional max-width resize, and savings stats.
Image Format Converter
Convert images between PNG, JPG, and WebP in your browser with configurable export quality.
Website SEO Analyzer
Run an instant on-page SEO audit on any public URL: title, description, canonical, H1 count, OG tags, and alt attributes.