IIS Brotli is provided "as is". If you encounter any difficulties, please let us know at For priority support or SLA enquiries please contact us through


Installation details are found on the documentation page.


  • Brotli encoding is currently only requested by browsers for https requests, to avoid trouble with bad intermediaries (proxies).
  • Dynamically generated content needs it's Content-Type header to be set in order to be compressed.

Brotli browser support

  • Firefox: 44+ (on by default)
  • Chrome: 49+ (not by default, but can be enabled)
  • Edge: 15+ (on by default)


A successfull test with one of the supporting browsers should show an accept-encoding:br in the request headers and subsequently a content-encoding:br in the response headers from the server.

Use the KeyCDN Brotli test tool to check whether Brotli compression is enabled on your website.


2018-01-17: v2.0 Upgraded to Brotli v1.0.2
2017-05-19: v1.1.2 Truncation bug fixed, added installer
2016-03-21: v1.1.1 Added compression scheme support
2016-03-18: v1.1 Initial release based on Brotli v1.0.1