Image Magick

Command Line Tool for digital picture editing, conversion.

Convert to webp

convert input.png -quality 80 output.webp

Compress PDF document

magick convert -density 110 -quality 10 -compress jpeg original.pdf output.pdf

batch processing reduce file sice / compress jpg

cd to directory of .jpg/.JPG files.

mkdir -p compressed

for file in *.jpg *.JPG; do
  [ -e "$file" ] || continue  # Skip if no match
  magick "$file" -resize 1920x1080\> -quality 70 -strip "compressed/$file"
done

-strip removes EXIF data.