I made a small tool for KDE Plasma (and other freedesktop desktops) that lets you easily customize single app icons:
- Use your own images or library
- Copy icon from another app
- Pick one icon from any installed theme (without switching global theme)
- Built-in pixel editor to create your own
- Batch apply, undo, overrides, missing icons overview
- Import image to turn it into an icon
Completely user-level, safe, and reversible. No manual .desktop editing.
GitHub: https://github.com/rayman1972/kappicon
AUR: kappicon or kappicon-git
Feedback welcome!-


in kde plasma this is possible by right clicking the start menu and selecting edit applications.
But this does more than that. Not only do you not have to deal with paths, it instantly shows you any icon from any theme installed, You can also opt for creating your own icon on a canvas, or import an image ‘jpg, webm, png’ and have it made into an icon. You can choose the shape of your icon (round, rounded corners, square). Heck, you can even import a picture with multiple icons and zoom/center the one you want. Sure, all of it is possible manually, but this tool makes it very easy, and creates backups where you can easily revert.