7 Best Free Image Optimization Tools Online (2026 Comparison)

7 Best Free Image Optimization Tools Online (2026 Comparison) Why image optimization matters in 2026 Images account for roughly 50% of the total bytes transferred on the average web page, according to the HTTP Archive . Unoptimized images slow down page loads, damage Core Web Vitals scores, increase CDN costs, and reduce conversion rates. A one-second delay in load time can reduce conversions by 7%, according to Akamai's research — and images are almost always the largest single contributor to t