About IIS Brotli

IIS Brotli is a free Brotli compression HTTP module for Microsoft IIS, it improves on the built-in IIS gzip compression ratio by roughly 17-25%.

Brotli is an open source data compression library from Google. We-Amp B.V. has made Brotli available for Microsoft IIS. You can either install it in IIS as compression scheme or native http module.