WindowTabs

WindowTabs is a free, open-source, and portable tool for Windows that transforms your desktop workflow. It adds browser-like tab bars to almost any application—File Explorer, Office suites, PDF readers, messaging apps like WeChat, code editors, and more. This lets you group related windows together, drag and drop tabs to merge them, and switch between tasks with a single click. The result is a dramatic reduction in taskbar clutter and a significant boost in productivity when handling multiple windows, all without installation or system bloat.