PDF4QT

PDF4QT is a free, open-source, cross-platform PDF editor that works on both Windows and Linux. It gets its name from the well-known Qt framework that powers it.

What Makes PDF4QT Stand Out?

You might be wondering if PDF4QT is really good or if it can compete with other paid software out there. Let’s break it down by looking at what this app offers and how user-friendly it is.

Built on Solid Foundations

This app runs on the Qt framework and uses a powerful C++ library along with a handy command-line tool. It also incorporates some third-party libraries like libjpeg, FreeType, OpenJPEG, OpenSSL, LittleCMS, and zlib.

Features to Love!

One of the coolest things about PDF4QT is that it supports multithreading and has hardware-accelerated rendering. This means you get smooth performance while viewing or editing PDFs.

The main goal of PDF4QT is to give you a complete experience for viewing and editing PDFs. And honestly, it mostly delivers, even though it's made by a small team in their spare time!

A Suite of Tools at Your Fingertips

This app comes with four different tools: PDF4QT Viewer Profi, PDF4QT Viewer Lite, PDF4QT DocPage Organizer, and PDF4QT DocDiff.

• Viewer Profi: This version includes features like encryption, reading documents, checking digital signatures, editing annotations, and searching text using regular expressions.


• Viewer Lite: If you want something simple for viewing PDFs, this one’s for you!


• DocPage Organizer: As the name suggests, this tool helps you manage individual pages—like merging or splitting documents.


• DocDiff: This handy feature lets you compare two PDFs to find differences.

Add Some Extra Features!

You can also optimize your PDFs (making them smaller without losing quality), convert files into audio books, or even read your PDFs out loud with text-to-speech features! Pretty neat, right?

User Experience Matters Too!

Keeps in mind that since this software comes from a small team—not a big corporation—it’s not going to have the flashy design some paid apps boast about. The interface isn’t terrible; it just lacks that polished look of high-end products. But hey, if it works well—and it does—that's what really counts!