PDF4QT: Open-source PDF viewer & editor with Qt framework. Features include encryption, text-to-speech, annotation tools, and more. Fast rendering & high-res support.
PDF4QT is a powerful, open-source PDF viewer and editor built on the Qt framework, offering a robust alternative to commercial options. This software includes C++ libraries for viewing and editing PDFs, along with a command-line tool available for both Windows and Linux platforms. It leverages modern C++ features and multicore CPUs for efficient PDF manipulation while supporting high-resolution monitors and PDF 2.0 standards. Key features include multithreading, hardware acceleration, encryption, color management, optional content handling, text layout analysis, signature validation, annotations, form filling, text-to-speech conversion, advanced annotation tools, file attachment management, document compression, a command-line tool, audio book conversion, an internal structure inspector, document comparison, redaction and document signing. Its flexible licensing caters to both open-source users and commercial applications.
