How to use the quality factor ?

How does this work ?

The quality factor is only valid for JPG and WEBP optimization. It won't have any effect on PNG/GIF optimization.

This option can be determined in a range between 0 (poorest quality) and 100 (best image quality). To provide a balanced image quality/file size ratio, this factor should be set between 80 and 92.

The quality factor has to be set with appending a GET argument called "qlty" with an integer value in the range [0;100].

The default value provided by the API is set to 92. Hence it will provide very good image quality by dramatically reduce your image file sizes.