PDF4QT is a free and open source PDF editor for Linux and Windows. Using PDF4QT, you can view, edit and create PDF documents. It comes with digital signature verification, encryption, annotation editing, command line interface, turn pages into images, plugins support, compare documents, audio book conversion, merge & split documents, redaction and many more. It is released under GNU Lesser General Public License v3.0.
How to Install PDF4QT on Ubuntu
Download PDF4QT in deb file format from the above download link and save it on your Downloads folder. Now in the terminal (ctrl+alt+t) run below PDF4QT install command.
sudo apt install ./Downloads/PDF4QT*.deb
sudo apt install ./Downloads/PDF4QT-1.3.4.deb
Note: Here “PDF4QT-1.3.4.deb” is the downloaded file name. You can change above command based on your downloaded file name and path.
After that open it via the Show Apps menu from Ubuntu dock.
Install PDF4QT via Flatpak:
You can also install PDF4QT via below command in the terminal app.
flatpak install flathub io.github.JakubMelka.Pdf4qt
And open it using below command.
flatpak run io.github.JakubMelka.Pdf4qt
Note: If you don’t have flatpak and flathub on your system, run below commands to install it in your system first and restart it after the installation.
sudo apt install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
And you can uninstall it using below commands.
flatpak uninstall io.github.JakubMelka.Pdf4qt
sudo flatpak uninstall io.github.JakubMelka.Pdf4qt