PDF4QT: Your Extraordinary and Free Open-Source PDF Editor

PDF4QT: Your Extraordinary and Free Open-Source PDF Editor

PDF4QT is a free PDF editor that is based on the Qt framework. It includes a C++ library, applications for viewing and editing PDF documents, and a command line tool. PDF4QT is available for Windows and Linux operating systems.

It offers a modern solution for viewing, editing, and rendering PDF documents, suitable for both users and developers. Developers can utilize the C++ library and command line tool in scripts, while users can take advantage of the four applications that provide various features.

The application offers basic browsing functionality and many other features, such as encryption, document reading, digital signature verification, annotation editing, text searching using regular expressions, converting pages into images, and more. Additionally, there are several available plug-ins.


These applications are primarily used by users who want to view, edit, manipulate, or compare PDF documents. Screenshots of the applications can be found in the screenshots section of the webpage.


  • Multithreading support
  • Hardware-accelerated rendering
  • Encryption
  • Color management
  • Optional content handling
  • Text layout analysis
  • Signature validation
  • Annotations
  • Form filling
  • Text-to-speech capability
  • Editing
  • File attachments
  • Optimization (compressing documents)
  • Command line tool
  • Audio book conversion
  • Internal structure inspector
  • Document comparison
  • Static XFA support (read-only, simple XFA only)
  • Electronically/digitally sign documents
  • Public key security encryption


  • Windows
  • Linux: Arch Linux, Ubuntu, Fedora, Debian, and LinuxMint
  • macOS


The project is hosted on Github and is licensed under LGPLv3, GNU Library or Lesser General Public License version 3.0 (LGPLv3)

Resources & Downloads

Download PDF4QT for free. Open source PDF editor. PDF4QT is open source PDF editor based on Qt framework. It contains a C++ library, applications for viewing/editing PDF documents, and a command line tool.
GitHub - JakubMelka/PDF4QT: Open source PDF editor.
Open source PDF editor. Contribute to JakubMelka/PDF4QT development by creating an account on GitHub.
PDF4QT is an open source PDF editor for Windows/Linux. This modern solution offers an unparalleled experience for viewing, editing, and rendering PDF documents.

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