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## Compress PDF With Ghostscript On Windows

Compress PDF with Ghostscript On Windows

Installation is easy but the installer doesn't put the directory in the PATH. Until that time, you will have to type in the whole path to run the program:
C:\Program Files\gs\gs9.21\bin\gswin64c.exe

Adding to the PATH allows you to run the program by just using:
gswin64c.exe

To change the PATH temporarily, you can add to the PATH by typing in the command line:
set PATH=%PATH%;C:\Program Files\gs\gs9.21\bin\;C:\Program Files\gs\gs9.21\lib\

Or you can:

• -right-click MY-COMPUTER/
• -click PROPERTIES
• -click ENVIRONMENTAL-VARIABLES (at the bottom-right).
• -in the lower section called "SYSTEM VARIABLES", find PATH
• -click EDIT
• -find VARIABLE VALUE
• -keep everything there
• -go to the end of the value
;C:\Program Files\gs\gs9.21\bin\;C:\Program Files\gs\gs9.21\lib\;

NOTE: do not remove any of the existing values.

### RUNNING GHOSTSCRIPT

The idea here is that Ghostscript will create PDF's for you without step-by-step interaction. Let's say you have a directory of PDF that somebody scanned at 1200dpi with each PDF at 10MB. After time, this directory becomes entirely too large. We can use Ghostscript to re-compress the PDF's by 90% and take each PDF down to 1MB.

Ghostscript is suite of commands and not just one command. The command we are interested in is: ps2pdf

To run for a single file:
ps2pdf -dPDFSETTINGS#/ebook C:\path\to\input\file.pdf c:\path\to\output\file.pdf

There are a bunch of options but the most are correctly set by default:
https://www.ghostscript.com/doc/current/Ps2pdf.htm

Here is a script to run for an entire directory. Create the batch file and name it compress-all.bat. Put the batch file in the directory for which you want to compress files. Run the batch file from command line. It will create a "compressed" folder and put a copy of the compressed files in there:
=====

@echo off
setlocal
set GS_OUTPUT_DIR=compressed
mkdir %GS_OUTPUT_DIR%
for %%i in (*.pdf) do ps2pdf -dPDFSETTINGS#/ebook "%%i" "%GS_OUTPUT_DIR%\%%i"