Correct Advanced documentation for page size says -s but seems to need -S
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anonymous
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We’ve done some testing. The correct option is -s.
Here’s an example, that downloads google.com as a pdf, has a zoom factor of 60%, uses landscape orientation, and A3 as the page size, and downloads the file as test.pdf:
pdfmyurl.com/?url=google.com&—zoom=0.6&-O=Landscape&—filename=test.pdf&-s=A3
Also have a look at the advanced options link on the home page, and the "—page-size " / "-s option, and the list of page sizes allowed here: