When you use html2image Linux on Linux OS, you can convert any URL into image.
But some times, you may need more advanced image processing features such as controlling the size of the image.
The solution is simple: you can use tools like ImageMagick or perl to easily resize the image to your size requirements after converting html to image with html2image linux.
The snap and processing tools can be glued together by linux shell script or any other scripting language like perl, php etc.