Image Compressor for Web

Why Image Compression Matters

Images typically account for 50-70% of a webpage's total size. Compressing images reduces page load time, improves Core Web Vitals (a Google ranking factor), saves bandwidth, and creates a better user experience — especially on mobile devices with slower connections.

Types of Image Compression

• Lossy compression: Permanently removes some image data to achieve smaller file sizes. JPEG uses lossy compression. At quality levels of 75-85%, the difference is virtually invisible to the human eye while achieving 60-80% size reduction.
• Lossless compression: Reduces file size without losing any data. PNG uses lossless compression. Smaller savings (10-30%) but the image is pixel-perfect identical to the original.

Image Formats Compared

• JPEG: Best for photographs and complex images with gradients. Lossy compression. Does not support transparency. Typical quality setting: 80-85%.
• PNG: Best for graphics, logos, and images with text or sharp edges. Lossless. Supports transparency (alpha channel). Larger file sizes than JPEG for photos.
• WebP: Modern format by Google. 25-35% smaller than JPEG at equivalent quality. Supports both lossy and lossless. Supports transparency. Supported by all modern browsers.
• AVIF: Even newer format. Up to 50% smaller than JPEG. Excellent quality. Browser support growing rapidly.
• SVG: Vector format — scales to any size without quality loss. Best for icons, logos, and illustrations. Not suitable for photographs.

Image Size Guidelines for Web

• Hero images: Under 200KB. Use JPEG at 80% quality or WebP.
• Thumbnails: Under 30KB. Resize to actual display dimensions.
• Blog post images: Under 100KB each.
• Total page weight: Keep all images under 1MB total for good Core Web Vitals.

Tips for Optimal Compression

• Resize images to their display dimensions before compressing — don't serve a 4000px image if it displays at 800px
• Use WebP format when possible (95%+ browser support)
• Implement lazy loading for images below the fold (loading="lazy")
• Use responsive images with srcset to serve different sizes for different screen widths
• Enable browser caching for images with appropriate Cache-Control headers