How to resize a pdf without losing much quality in Linux Mint Ubuntu Debian Redhat Solution
Do you have a PDF that was too large after merging using convert / ImageMagick?
Use gs or ghostscript as below, specify the output file and also the input file.
In the example below the output file is "outputfile-resized.pdf" and the input file is "original-pdf.pdf". Change the input file to the name of your pdf
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -dNOPAUSE -dQUIET -dBATCH -sOutputFile=outputfile-resized.pdf original-pdf.pdf
For example the above method took a pdf from 12MB to about 500KB with no noticeable quality loss.
More Size Savings
In some cases with very high quality PDF's with images (eg. 300dpi), you may only save 20-30% which may not fit the Inbox of some e-mail providers still.
The next option is to change your DPI to be 150:
-dColorImageResolution=150
Add the above flag and adjust the 150 to be whatever dpi you need. The above example took a 47MB image down to 6.5MB.
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