This software performs the magical pdf-to-pdf conversion popular in academic journal submission sites.

New speedup in version 2. Still runs in O(1) time, but now ~15% faster! Version 2 now requires you compile the C++ code fast.c thusly:

g++ fast.c -o fastpdf.

Requires imagemagick. It can probably be installed like this:

• macOS: brew install imagemagick
• Ubuntu: sudo apt-get install imagemagick

bash pdf2pdf.sh pdf_filename1 pdf_filename2 ...

The software first checks whether each file is actually a pdf file, and then converts the pdf files into slightly worse pdf's. It skips any files that are not pdf.

So, the following will convert all pdf files in the current folder: bash pdf2pdf.sh *

Each listed pdf file will be converted to a lower-resolution pdf saved as "RandomNumber.pdf" in the current working directory.