@tcr : I have trouble understanding how crop() is supposed to work. I have updated the method documentation as per this stackoverflow answer but running tests I have trouble getting a meaningful result. For example,

 scissors(infile)
        .pages(1,2)
        .crop(0,0,40,70)
        .pdfStream()
        .pipe(fs.createWriteStream(outfile)

just produces pages 1 and 2 of the infile uncropped, although it should return a 40X70 box from the lower left (112x196 mm).

Did this ever work for you?