How to shrink a scanned PDF on Linux

When you want to reduce the file size of a PDF document, this quick command using convert will shrink the original PDF file.

convert -density 150×150 -quality 60 -compress jpeg -colorspace Gray original.pdf new.pdf

This command is particularly useful against scanned documents, the jpeg quality will be 60% for 150dpi.

Converting an original 300dpi / color PDF to a 150dpi, greyscale PDF can reduce file size up to 50%. There will be some quality loss but in this way you can reduce file size enough to send scanned documents of dozens of pages via e-mail without using third-party services.

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