@arjun98 said in How do you properly increase QLineEdit increase icon size/:

ui->searchbar->setClearButtonEnabled(true);
ui->searchbar->QLineEdit::addAction(QIcon(":/img/icons/icon_search.png"), QLineEdit::LeadingPosition);

I have tried loading icon to line edit using above code, it's clearly visibile. and image is not blurred.
try to experiment loading the icon to QLineEdit without any stylesheet being set to it.

hi
As far as I know there is no build in raster to vector conversion.
Also many images are not really good for it.

Im wonder if QGraphicsScene is scaling images with best quality.
http://stackoverflow.com/questions/22652491/qt-resize-image-with-best-quality