Enables features that are disabled by default.



Allowed values

upscaleAllow images to be resized such that the output image's dimensions are larger than the source image.


  1. Image upscaling is discouraged because it increases both the file size and delivery time of the image to the end user with no visual improvement. We recommend handling upscaling on the client-side (e.g., using a web browser or native application).
  2. The upscale value must be used with the width, height, or dpr parameters to see any effect in the output image.


Click the links to view the transformed image using a demo Fastly IO service.

Example usageDescription
?width=2560&enable=upscaleResize the image to 2560px wide despite the source image being smaller