I'm using PDFStitcher software to stitch all of my PDF pages to a new PDF page, everything work fine, but my PDF page has a margin at bottom, can PDFStitcher remove a small margin at bottom of page before stitch?? See image below and the input PDF for you to test is attached.
I checked your PDF file, because these small margins were exist in your original PDF file, so PDF Stitcher couldn't remove these small margins during stitch, thanks for your understanding.
However, you can use "VeryDOC PDF Margin Crop" to remove the margins from a PDF file first,
after that, you can use PDF Stitcher to stitch the PDF pages into a new PDF file again, I hope "VeryDOC PDF Margin Crop" software will helpful to you, you may give it a try.