Pdf4qt
An open-source toolkit for Windows and Linux, PDF4QT combines desktop apps, command-line tools, and a C++/Qt engine for PDF work.
About Pdf4qt
Pdf4qt is an open-source PDF toolkit for Windows and Linux. It provides a MIT-licensed C++/Qt PDF engine based on PDF Reference 2.0, with a document viewer, a command-line tool, and a page manipulator application. It covers tasks such as form filling, annotations, signature validation, and document comparison.
Static XFA support is limited to readonly, simple XFA only. The software is provided without warranty, and users must comply with the licenses of included third-party libraries.
Key features
- Document viewer application
- Command-line tool for PDF tasks
- Page manipulator application
- Form filling and annotations
- Signature validation and digital signing
- Compare documents
Best for: Windows and Linux users who need open-source desktop and command-line tools for PDF viewing and editing.
Good for
- Open-source with MIT-licensed C++/Qt engine
- Provides viewer, page manipulator and command-line tool together
- Implements functionality based on PDF Reference 2.0
Watch out for
- Stated platform support is Windows and Linux
- Static XFA support is limited to readonly, simple XFA only
- Provided without any warranty of any kind
Pdf4qt at a glance
- Website
- github.com/JakubMelka/PDF4QT
- Category
- Online Tools › PDF & Document Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for PDF & Document Tools
Pdf4qt alternatives
Tools and sites you could use instead, ranked by how closely they match.
Turn web pages into PDF, EPUB, HTML, or Markdown documents with Percollate, a command-line tool.
Open source
12 alternatives
PDFCraft describes a browser-based toolkit for editing, converting, merging, splitting, and securing PDF files.
FreeOpen source
18 alternatives
For Windows and Linux, PDF4QT offers an open-source editor and reader, rendering tools, desktop applications, command-line tools, and a C++ library.
This repository contains plugins for Umi-OCR, including components that add OCR engines.
Open sourcePick
10 alternatives
Merge or split PDF documents and rotate, crop, or rearrange pages using PDF Arranger, a Python GTK application.
Open source
15 alternatives
Dangerzone converts potentially dangerous PDFs, office documents, and images into PDFs described by the project as safe.
Open source
14 alternativesPopular in PDF & Document Tools
Well-known listings from the same topic.
2OCR2ocr.com2PDFConverter2pdfconverter.comBentopdfgithub.com/alam00000/bentopdfOCRToolocrtool.netPDFCoffeepdfcoffee.comPDF24pdf24.org
Pdf4qt FAQ
Which operating systems does Pdf4qt support?
Microsoft Windows and Linux.
Under what license is Pdf4qt available?
It was relicensed under the MIT License as of April 27, 2025, after originally using LGPLv3. It also uses third-party libraries with their own licenses.
What XFA support is included?
Static XFA support, readonly and simple XFA only.
Is something wrong or out of date?
Tell us and an editor will check it.
Own this website?
Claim this listing
Claim the listing and suggest updates yourself. An editor checks every claim first.