[Interest] New open source PDF support library for Qt + serveral PDF applications

Jakub Melka mgr.jakub.melka at gmail.com
Thu Sep 23 20:31:42 CEST 2021

Hello David,

The software is designed to be as cross-platform as possible and 
contains only small components that depend on MS Windows. I plan to add 
Linux and macOS support in the future, but I just haven't had time for 
that yet. I chose MS Windows as the supported operating system because 
it has the most users and therefore potentially the most people 
interested in my software. It would also be necessary to edit .pro files 
that are only ready for MS Windows and implement platform dependent 
issues, for example, font handling.

Currently, I am fully focused on preparing a program for comparing 
similar pdf files so that it is comparable to commercial programs. 
Detection of page or text movement will also be supported, including 
visualization of changes in the window. This functionality is a bit 
complex and I expect to be able to complete it sometime in November or 

Best regards,
Jakub Melka

Dne 23.09.2021 v 8:23 David Skoland napsal(a):
> Hi Jakub,
> Thanks for sharing. This does look very interesting. Is there anything 
> in the code or dependencies that explicitly depends on Windows, or 
> could this in theory be compiled to macOS or linux with some 
> additional work?
> Cheers,
> David Skoland
>> On 22 Sep 2021, at 19:26, Jakub Melka <mgr.jakub.melka at gmail.com 
>> <mailto:mgr.jakub.melka at gmail.com>> wrote:
>> Dear Qt users,
>> I would like to inform you about my project, PDF4QT. I began this 
>> project in year 2018 as my private project, and now, I think, it is 
>> ready to be released for public beta testing. Long term goal of this 
>> project is to offer full support of PDF 2.0 specification as add-on 
>> library for Qt. I know, that Qt offers its own PDF module, but, it 
>> lacks many functionality. My project offers much more, as optional 
>> content handling, signature verification, encryption support, form 
>> filling, color management, annotations, text to speech, 
>> optimalization, sensitive content redaction, page manipulation, 
>> document merging and splitting and much more. Also, I offer several 
>> applications, which use this library, such as document viewer/editor, 
>> or command line tool.
>> I am aware, that some other projects also implements this 
>> functionality, but they are very often using viral licenses such as 
>> GPL/AGPL. I want to be more benevolent, so PDF4QT project uses LGPL 
>> license, version 3, so it is usable also in commercial applications. 
>> I do not want to restrict people from using my library.
>> Project can be found at this website:
>> https://github.com/JakubMelka/PDF4QT 
>> <https://github.com/JakubMelka/PDF4QT>
>> And public beta release is available here:
>> https://github.com/JakubMelka/PDF4QT/releases
>> I hope you will find my 3-year work useful.
>> PS. I will be very happy if you can contribute in a form of testing, 
>> advices, opinions... But I also want to keep control of the rights to 
>> my project, so if you want to contribute, Contributor License 
>> Agreement must be signed.
>> Please do not respond on my email, but if you want to discuss this 
>> software, use following discussion forum:
>> https://github.com/JakubMelka/PDF4QT/discussions
>> Best regards
>> Jakub Melka
>> _______________________________________________
>> Interest mailing list
>> Interest at qt-project.org
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