imgproxy

imgproxy is an image server that resizes and converts images on the fly, driven by parameters in the request URL. It is written in Go and depends on the libvips image library, as the installation docs note. The docs recommend running it as a standalone application in a Docker container from the official image on GitHub Container Registry. Other install paths are a Linux package build script and an AWS CloudFormation template. Foxes With Matches, Inc. develops the project.

Worth knowing

The open-source version holds all free features, and a closed-source Pro version is sold separately. The license is stated two ways: the LICENSE file names Apache-2.0, while the docs say MIT.