DietPDF aims at reducing PDF file size while not degrading quality nor losing metadata

Frédéric BISSON

Last update: Jul 27, 2022

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PDF Files Processing dietpdf

Overview

dietpdf

DietPDF aims at reducing PDF file size while not degrading quality nor losing metadata.

Description

DietPDF aims at reducing PDF file size while not degrading quality.

Here are some tricks used to achieve this goal:

Use Zopfli instead of Zlib to get better compression ratio while being compatible with Zlib.
Use JpegTran to optimize and remove unnecessary data from embedded JPEGs.
Use of Run-Length Encoding to help Zopfli achieve better compression.
Use Zopfli on embedded JPEGs, it helps sometimes
Remove unnecessary spaces in the PDF
Converts end of lines to spaces in Form Objects or Contents (this helps compression)

It also comes with extractpdf which extract all the streams contained in a PDF file.

Notes

This program is not ready for production!

It does not support cross-reference objects for the moment.

This project has been set up using PyScaffold 3.3.1. For details and usage information on PyScaffold see https://pyscaffold.org/.

Requirements

This is plain Python 3 using (quite) only standard libraries.

It uses the following external programs:

zopfli (apt install zopfli)
jpegtran (apt install libjpeg-turbo-progs)

Installation

In dietpdf directory:

pip3 install .

python3 setup.py install --home=~

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Comments

More features to add

Can you look into other requests and remarks made under CPDF project:

https://github.com/johnwhitington/cpdf-source/issues/67

https://github.com/johnwhitington/cpdf-source/issues/160

https://github.com/johnwhitington/cpdf-source/issues/161

opened by maadjordan 2