Is there software for resizing images from a website page to render size?

Question

Image processing

Previously, the Google PageSpeed ​​Insight service had the ability to download optimized images. Not only the efficiency of image compression has been optimized. The service reduced the resolution of images to render sizes specified in CSS. Are there currently working alternatives to such a tool? So that you can give the url of the page, and at the output get an archive with images of "effective" resolution.

Answer 1

I don't know, but it's easy to do. js on the client and imagemagick on the server.
JS resizes the window according to the given list if adaptability is needed. Measures the size of each available picture and sends them to the server.
The server makes thumbnails of the images.
Total - 5 lines for JS and 5-10 lines for php-imagick, for example.