Fill Mode fill

The fill parameter determines how the excess space in an image resized with fit=fill or fit=fillmax should be filled.

Valid values are solid, blur and gen(generative). Note that fill=gen is a premium feature.

fill=solid

Fills the excess space with the solid color specified by the fill-color parameter. If fill-color is not used, the excess space will be white or transparent, depending on whether the image output format supports transparency.

fill=blur

Fills the excess space with a blurred version of the original image. The behavior of fill=blur is identical to the blur parameter but is applied only to the excess space.

Resized with fit=fill and fill=blur

fill=gen

Premium Feature
Generative Fill is currently available for imgix customers on a specific plan. If you’re interested in this feature, please contact our sales team to get more information.

The fill=gen mode employs artificial intelligence to seamlessly fill in extra space with generative rendering, enhancing the visual content by adding relevant details where needed.

This approach allows for a more complete fill output by utilizing AI's capabilities to expand beyond the original confines of the image. By analyzing the context and content of the existing image, fill=gen intelligently generates and integrates additional elements so you can create the best frame without having to crop out the rest of your images.

Here are some examples below:

Original image: Original image https://assets.imgix.net/example-images/generative-fill/dog-snow-01.jpg?w=500&h=900&auto=compress,format&dpr=2

Generative fill fit=fill&fill=gen https://assets.imgix.net/example-images/generative-fill/dog-snow-01.jpg?fit=fill&fill=gen&w=500&h=900&auto=compress,format&dpr=2

Generative fill outputs are cached and saved for subsequent resizing or other image transformations as long as the generative fill parameters are unchanged. This includes other additional parameters for controlling and modifying the generative fill.

Parameters modifying generative fill output can be found here:

See the API specification for more information about this parameter's value ranges and format.