Use flate monochrome to reduce pdf size

PDF compress command line is an interface tool to fulfill part of the functions of Advanced PDF Tools such as optimizing pdf files and compressing images. It is an advanced tool tailored for your swift and high-level optimizing pdf file. Compared with other tools, it holds a striking advantage, reducing pdf size while maintaining accessibility and search engine visibility. The rest part of this article will show you how to use flate monochrome to reduce pdf size via Advanced PDF Tools Compress Command Line.


First step—Downloading Advanced PDF Tools

Follow this link you will obtain Advanced PDF Tools

The whole package is just of 3.04 MB, making the download swiftly, do remember to extract it, for it is a zipped package.


Second step—Configuring file “compress.ini

This step is critical, for it contains the optimizing and compressing options list, details are as follows:

1) open the Advanced PDF Tools folder and find file “compress.ini”

Advanced PDF Tools folder

2) open the  file “compress.ini” and find [monimage] compressformat=2



Monochrome image

  • compressformat=2
  • 0: Not change; 1: Flate compression; 2: CCITT Group4 compression
    where 0 is the default value.
  • imagesize=40
  • Set scale ratio to black and white image, the value is from 1 to 100
    where 100 is the default value.

you can find number 1 refers to flate compression, so you have to change 2 to 1


3) save the file “compress.ini”


Third step—Launching MS-DOS command prompt window

You are bound to launch MS-DOS command prompt window. Because the compress command line is bound to be operated under the MS-DOS environment. The procedure is easy, and the following pictures will guide you.

start the dialog box of “cmd.exe”: press  “start”>choose “Run”>input “cmd”>press “ok”

way to launch  command prompt

when the following appears, you will have the MS-DOS command prompt window

command prompt


Fourth step—Inputting compress command line

input compress command line to use flate monochrome to reduce pdf size

it goes below

pdfcompress.exe -i C:\input.pdf -o C:\output.pdf


  • the option -i is to input a PDF file,
  • the option -o is to specify a destination file.

when the input is done, press “enter” key, you will finish the task to use flate monochrome to reduce pdf size

detailed progress displayed in command prompt

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