The following shows a Possible Doppler-splitted PDF file with 8 pages: A possible Doppler-splitted PDF file with 2 pages: The Doppler is split, I am not able to determine if the content of the PDF file changed, but there appears to be a difference in the size of the PDF files, but these pages are the same length. Separate is not able to do a partial or partial-split. I am not in the habit of splitting PDFs (maybe I could do a better job of explaining that, but right now I'm too busy). My use was mainly a one of the following three cases: 1) Use separate to split only one PDF file into multiple files. This could be the case of a single PDF file for a series of PDFs. 2) Use Doppler split to split a PDF file into multiple files, and then use a utility like tiff and Open-Xchange to extract the separate pages. 3) Split a PDF file and then rearrange the segments of the file to make a new PDF file from the data. I'm sure the third option is not a common use case. Splitting a PDF file with Doppler on Ubuntu 16.04 and 17.04 LTS With Doppler 0.8.9-5, two PDF files may be generated after a split: pdf2.pdf and pdf0.pdf: They are each 80×160 pixels. I'm running 2×1 for a 16:10 aspect ratio for the PDF files. These dimensions are roughly the same that were printed on my printer. The PDF files are saved in .pdf format. Both documents have the same contents — they are two pieces of paper. I split both documents separately with Doppler for both PDFs: pdf2.pdf — split to separate pages. Pdftotext — split to split pages (see below) For both, I also chose the same text sizes for both and selected the same font settings: I chose one font, Benefit, for the text. The pages are 8.5 MB and 10 MB respectively.