You can change the compression (output format and quality) of your image by using compression filters. You can use the compression filters alongside transformation filters.
By default, Cloudimage delivers the images as WebP. If the format is not supported by the client browser, it falls back to JPEG or PNG.
You can of course force a specific output format(s). More details can be found in the image formats section.
For troubleshooting purposes, you can add the ci_info=1 operation to view details about resizing and compression, example: /v7/sample.li/hotel.jpg?force_format=png&ci_info=1