How to Install Qtdesigner?

If you are on macOS and use brew you may have installed qt already using brews installer.

In that case you already have QT Designer installed even though it is not mentioned anywhere.

You can find it here: /usr/local/Cellar/qt/<qtversion>/libexec/Designer.app

So to place it in your local apps folder you can create a symlink to it like this:

ln -sf /usr/local/Cellar/qt/5.11.1/libexec/Designer.app ~/Applications/.

Install QtDesigner on windows:

install designer on Linux:

It can be installed using the apt package manager

sudo apt-get install python-qt4 qt4-designer

run the command designer and it will work for you

if it doesn't try /usr/bin/designer

it worked for me i am using python 3.6 with pyqt-5.16

It is there. Create a form, click on the .ui file and it opens automatically.

Install the latest version of "pyqt5-tools" using pip install pyqt5-tools --pre

Then run the command (designer.exe) then you are good

Expanding StonyBoy answer. If you are on macOS, you have installed Qt5 with brew, and you want to access the Qt5 Designer app via command line (like on Linux), you can set a symlink to the actual executable as well, like this:

ln -sf /usr/local/Cellar/qt/5.13.1/libexec/ /usr/local/opt/qt/bin/designer

This way, the designer command will be placed in the bin folder, together with the other Qt5 executables (as qmake). Thus, you will be able to launch it simply by typing designer in your shell.

Note: of course you must have the path of the Qt5 bin/ folder added to your PATH environmental variable, for being able to directly call designer in the shell. But brew added it for you when you installed Qt5.

I got pyqt5 installed along with the tools when I pip install pyqt5-tools. If you prefer PySide2, qt-tools will work better. You can emulate a "dry-run" by creating a fresh, disposable virtual environment to test on. Obvious, I know, but I use them infrequently enough that it takes me a while to remember sometimes :)

I found it here:

..\Lib\site-packages\qt5_applications\Qt\bin