Last Updated on April 10, 2026
PDF4QT is a cross-platform PDF editor.
The software consists of four applications:
- PDF4QT Viewer Profi: Go beyond basic browsing. This tool packs a punch with a host of advanced features, including encryption, document reading, digital signature verification, annotation editing, and even support for searching text using regular expressions. Turn pages into images, and enhance your PDF interactions with multiple available plugins.
- PDF4QT Viewer Lite: Simplify your viewing experience. This lightweight viewer offers essential viewing functions in a clean, user-friendly interface.
- PDF4QT DocPage Organizer: Take control of your documents. Manage whole documents or individual pages with ease. Merge documents into a single file, or split them into multiple ones. You can also move, clone, or add pages with a few clicks, all within an intuitive user interface.
- PDF4QT DocDiff: Spot differences effortlessly. This tool allows users to open two documents and receive a detailed list of differences. View these differences in a page-to-page window where they are clearly marked. Save these differences into an XML file for future reference.
Key Features
- Multithreading Support: Harness the power of multicore CPUs for faster, more efficient PDF processing.
- Hardware Accelerated Rendering: Enjoy seamless, high-quality rendering with hardware acceleration.
- Encryption: Ensure your documents’ security with robust encryption capabilities.
- Color Management: Maintain the integrity and accuracy of your PDF’s color profiles.
- Optional Content Handling: Have full control over what content to display or hide.
- Text Layout Analysis: This feature allows for an in-depth analysis of your existing text, enabling the conversion of PDFs into text, thereby facilitating a more efficient editing and formatting process.
- Signature Validation: Verify digital signatures with ease and confidence.
- Annotations and Form Filling: Make your PDFs interactive with annotation and form filling features.
- Text to Speech Capability: Access your PDFs in audio form with text to speech conversion.
- Advanced Annotation Tools: Enhance your PDFs by adding annotations, images, text and more.
- File Attachments Management: Easily view and manage the list of attached documents in your PDFs and save them to your desired location.
- Optimization: Reduce file size without compromising quality with document compression.
- Command Line Tool: Easily access and control PDF4QT via command line.
- Audio Book Conversion: Convert your PDFs into audio books for convenient access.
- Internal Structure Inspector: Understand your PDFs better with a detailed view of their internal structure.
- Compare Documents: Easily identify differences between similar documents.
- Redaction: Safeguard sensitive information by removing it from your PDFs.
- Document Signing: Sign your documents digitally for authenticity and validation.
- …and much more! Delve into the world of PDF4QT and experience a new standard of handling PDFs.
- Cross-platform support – runs under Linux and Windows.
Website: github.com/JakubMelka/PDF4QT
Support:
Developer: Jakub Melka
License: GNU Lesser General Public License v3.0
PDF4QT is written in C++. Learn C++ with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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