How to Optimize Amazon S3 Images via ShortPixel Global CDN (Serve Faster & Reduce Costs)

If you store images in Amazon S3, you're probably paying more than you need to for bandwidth. Every time a visitor requests an image, S3 serves the original file — full resolution, uncompressed, in whatever format you uploaded it. No resizing, no format conversion, no optimization. Multiply that by thousands of daily requests and it adds up fast. There's a straightforward fix: put an image-optimizing CDN between S3 and your users. The CDN fetches the original once, optimizes it (resize, compress, convert to WebP/AVIF), caches it globally, and serves the lighter version from the nearest edge server. Your originals stay untouched in S3. In this article, I'll walk through how this works using ShortPixel CDN as the optimization layer, but the concept applies broadly to any URL-based image CDN. The Problem With Serving Raw S3 Images S3 is excellent for storage — reliable, cheap per GB, scalable. But it's not an image delivery service. When you serve images directly from S3 (or even through