HowTo: Scale Qt application KeePassXC

Posted Over 1 year ago. Visible to the public.

If you have a notebook with WQHD-display the scaling of Qt applications could be negatively affected. E.g. the KeepassXC icons and text could be rendered so large that KeePassXC is not usable and there aren't settings in the application for downscaling.

Fix with a .desktop file

The scaling of virtualbox, vlc and zoom wasn't an issue, therefore this fix is only for KeepassXC. The application was installed with snap, but the principle is the same when installed differently. Copy your keepassxc_keepassxc.desktop file in /var/lib/snapd/desktop/applications to ~/.local/share/applications. Then change the line with Exec and add your Qt scaling parameters. With QT_AUTO_SCREEN_SCALE_FACTOR=0 automatic scaling can be disabled Show snapshot . Now it is also possible to add your own scale factors with QT_SCREEN_SCALE_FACTORS=0.9, but that wasn't necessary in this case.

[Desktop Entry]
# Exec=env BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/keepassxc_keepassxc.desktop /snap/bin/keepassxc %f
Exec=env BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/keepassxc_keepassxc.desktop QT_AUTO_SCREEN_SCALE_FACTOR=0 /snap/bin/keepassxc %f

To test your factors you can use your notebook with an external monitor and start KeepassXC or other Qt applications from your terminal:



If you are using wayland (in combination with fractional scaling) another possibility might be forcing the use of X11 or GTK themes Show snapshot for your Qt applications in the wayland session. For this install e.g. the qt5ct package and add a configuration for systemd user environment variables Show snapshot (e.g. ~/.config/environment.d/10-qt.conf) with the Qt theme you want:

# QT_QPA_PLATFORM="xcb" for X11

You can use the theme in combination with the aforementioned scaling factors.

Simon Hofmann
Last edit
Over 1 year ago
Simon Hofmann
Qt, KeePassXC, WQHD, Wayland
Source code in this card is licensed under the MIT License.
Posted by Simon Hofmann to makandra orga (2022-03-04 11:09)