Command line tools to edit pdfs
- 1 The pdfjam command
- 2 The convert command (program Imagemagick)
- 3 PDF compression with Ghostscript
The pdfjam command
Join PDFs into one file
Install PDFjam (or log on to Sverdrup) to extract pages from a PDF into another PDF. See also http://manpages.ubuntu.com/manpages/precise/man1/pdfjam.1.html To join several PDFs into one file, make sure you are in the folder containing the PDFs you'd like to merge.
cd pdffolder # navigate to the appropriate folder
Then simply type
pdfjam file1.pdf file2.pdf file3.pdf -o file123.pdf
You should get a message like this (make sure the last line reads "Finished. Output was to..".
---- pdfjam: This is pdfjam version 2.08. pdfjam: Reading any site-wide or user-specific defaults... (none found) pdfjam: Effective call for this run of pdfjam: /opt/app-sync/texlive/uio-texmf/bin/x86_64-linux/pdfjam --trim '23.6cm 5cm 14.8cm 0.5cm' --clip 'true' --outfile fig_Jul.pdf -- facet_Apr-Aug-Nov_sign_circ_C_.pdf - pdfjam: Calling pdflatex... pdfjam: Finished. Output was to 'fig_Jul.pdf'.
Alternative way to do this in Windows
In Windows, files can be merged using Adobe Acrobat Pro (on a remote desktop to win.uio.no), choose "Merge PDFs into one file". You may also use Adobe Acrobat Pro to save a PDF in Word format (save as/save as other/word).
Extract pages from PDF
To extract pages from a PDF into another PDF, type
pdfjam -o outfile.pdf infile.pdf wantedpage1,wantedpage2
Join PDFs into one file - several sheets per page
After convert has joined several PDFs, PDFjam can be used to put several sheets on one page. Here, I prepare a 12-page PDFs into one-page PDF (3 columns, 4 rows), before printing:
pdfjam --nup 3x4 --landscape my_12_slides.pdf --outfile my_1_page_handout.pdf
Contained in PDFjam is a lot of useful commands, such as pdf90 which rotates your file:
pdf90 operates on one or more PDF files, and (either with the '--batch' option or with '--outfile DIR' where 'DIR' is a directory) the resulting files have the suffix 'rotated90' applied to their names by default. To change the suffix, use the '--suffix' option, for example
pdf90 --suffix '-turned' --batch myfile1.pdf myfile2.pdf
will result in files named 'myfile1-turned.pdf' and 'myfile2-turned.pdf'. (From http://linux.die.net/man/1/pdf90)
To crop your pdf to a smaller pdf, use the commands --trim 'left bottom right top' --clip true. "left" should be given on the form "xcm" and means the amount of centimeters you'd like to crop from the left side, and similar for the other numbers.
pdfjam --trim '1cm 5cm 36.5cm 0.5cm' --clip true large_figure.pdf --outfile smaller_figure.pdf
The convert command (program Imagemagick)
Install Imagemagick (or log on to Sverdrup), and use the "convert" command:
convert infile1.pdf infile2.pdf outfile.pdf
If the quality is reduced, use the -density flag (the higher number afterwards, the better. 600 is good). If you are converting from a JPEG/MIFF/PNG file to pdf, use -quality instead.
convert -density 600 infile1.pdf infile2.pdf outfile.pdf
Join picture files into one file
convert -quality 600 infile1.jpg infile2.jpg outfile.pdf
PDF compression with GhostscriptGhostscript is a powerful tool for pdf compression. The following code compressed a PhD thesis of 88 Mo into a 22 Mo pdf file. Just edit output.pdf and input.pdf to the name of your output and input file. Source: tjansson.dk. . Install Ghostcript binaries from the official gs website for Windows and Linux or from Brew //Macport for Mac.
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf