PDF to PNG to PDF on macOS using ImageMagick

ImageMagick is an awesome command line tool for working with images.

Convert PDF to PNG files with magick

Convert a multi-page PDF file to PDFs with ImageMagick using the following command:

magick density -300 input.pdf -resize 30% outdir/output.png

You can adjust the density and resize values for your preferred file size and quality.

Select all output PNG files, right click, go to Quick Actions → Create PDF.

I did attempt the following command but the images were smaller than ideal.

cd outdir
magick *.png -scale 1311x1819 \
    -units PixelsPerInch \
    -density 300x300 output.pdf

Doing it all with ImageMagick would make this easier to script.