pdftocairo -paper crop
-paper size
Set the paper size to one of "letter", "legal", "A4", or "A3" (PS,PDF,SVG only). This can also be set to "match", which will set
the paper size of each page to match the size specified in the PDF file. If none the -paper, -paperw, or -paperh options are speci‐
fied the default is to match the paper size.I suggest to add a crop value to the pdftocairo -paper option to mean the crop area dimensions, specified by the -W and -H options.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information