Compress Images for Website — Free, Fast & Private
Images account for 40-60% of total page weight on most websites. A single unoptimized hero image can be 3-5MB — larger than the rest of the page combined. This directly impacts your Largest Contentful Paint (LCP) score, which Google uses as a ranking signal. Compressing images is the single most impactful performance optimization most sites can make.
MiniPx compresses your web images in your browser. Drag in your entire image folder, choose WebP format with Smart compression and 1920px max width, and download optimized images ready for upload. No server processing, no API keys, no monthly limits.
For websites, the recommended workflow is: start with WebP format (25-35% smaller than JPEG), use Smart compression (50-70% size reduction), and cap width at 1920px (no visitor has a wider viewport in practice). This combination typically reduces a 4MB hero image to 150-300KB with no visible quality difference.
Image optimization checklist for web
Choose the right format: WebP for photographs and complex images. PNG for logos, icons, and graphics with transparency. SVG for simple vector graphics. Avoid BMP and TIFF on the web entirely.
Right-size your images: Do not upload a 4000px image for an 800px content area. Resize to the maximum display width (or 2x for retina). MiniPx lets you set a max width during compression.
Compress aggressively: Smart quality (65%) is indistinguishable from the original in photographs at web display sizes. Most visitors view images on phone screens — subtle quality differences vanish on small displays.
Strip metadata: EXIF data adds kilobytes to every photo. GPS coordinates, camera settings, timestamps — none of this is useful on a website. MiniPx strips metadata by default.
Impact on Core Web Vitals
Google measures three Core Web Vitals: LCP (Largest Contentful Paint), CLS (Cumulative Layout Shift), and INP (Interaction to Next Paint). Images primarily affect LCP — the time it takes for the largest visible element to render. On most pages, the largest element is an image. Compressing that image from 3MB to 200KB can improve LCP by 2-4 seconds on mobile connections.
For a deeper guide on images and Core Web Vitals, read our complete optimization guide. For WordPress-specific advice, see compress images for WordPress.