Thumbor is a free, open source image CDN that makes it easy to compress, resize, and transform images. This post lets you try out Thumbor firsthand without needing to install anything. We've set up a sandbox Thumbor server for you to try out at http://34.67.235.246:8888. The image that you're going to experiment with is available at http://34.67.235.246:8888/unsafe/https://web.dev/backdrop-filter/