[Application] UseCustomUITheme=true Then, you must define a stylesheet. But the fontSize key here is largely deprecated in v4.5+. The real power comes from . Layer 3: The Custom Stylesheet (The Power Move) This is where qBittorrent transforms. The application accepts a full Qt StyleSheet (QSS)—a CSS-like language for Qt widgets. You are no longer asking for a font size; you are dictating typography to every single UI element.
Open qBittorrent > Tools > Preferences > Behavior. At the bottom, check "Use custom UI Theme" and browse to your style.qss . qbittorrent increase font size
At first glance, qBittorrent seems stubborn. There is no "Increase Font Size" slider in the main preferences. This absence isn't an oversight but a philosophical choice rooted in its reliance on native Qt frameworks. However, dismissing it as inflexible would be a mistake. Under the hood, qBittorrent offers four distinct layers of typographic control, ranging from the dead-simple to the surgically precise. Before hacking config files, understand that qBittorrent is a Qt-based application. It inherits its default scaling behavior from the OS environment variable QT_SCALE_FACTOR . Layer 3: The Custom Stylesheet (The Power Move)
/* Log and status bars */ QTextEdit, QStatusBar { font-size: 12pt; } Open qBittorrent > Tools > Preferences > Behavior
Save a file named style.qss anywhere. Inside, write: