One liner with ghostscript GS to make your pdf much smaller. Options for PDFSETTINGS are (in rank of output quality): /prepress /ebook /screen gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed_PDF_file.pdf input_PDF_file.pdf En Masse Compression: 972M -> 457M I applied this with a script upon my 972M directory of hundreds of research pdfs, and the end result was less than half the size (457M). I converted each PDF to text, which is useful for most of them, and then moved each PDF to an “uncompressed” directory, then compressed that uncompressed/FILE.

One liner with ghostscript GS to make your pdf much smaller. Options for PDFSETTINGS are (in rank of output quality): /prepress /ebook /screen gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed_PDF_file.pdf input_PDF_file.pdf Resources https://itsfoss.com/compress-pdf-linux/