If you have a valid Visio license and need it on a USB drive for occasional use on trusted PCs, you can try (not true portable but practical):
Official "portable" versions of Microsoft Visio do not exist. Microsoft does not release its Office or diagramming software in a standalone portable format (one that runs from a USB without installation). However, there are official and unofficial ways to achieve a "portable" workflow for diagramming. 💻 Official Alternatives to Portable Visio
: For users who only need to open and view diagrams on various devices without editing, the Microsoft Visio Viewer is a common lightweight solution.
The search for is a fool’s errand—or a hacker’s trap. Microsoft has architected Visio to be an integral part of the Windows ecosystem, not a standalone executable you can slip into a pocket.
If you require a standalone application that can run directly from a USB drive (true "portable" software), third-party alternatives are often used:
Go to diagrams.net > Download > “Offline (Portable)” > Save to USB drive. Plug into any Windows PC, double-click, and diagram.
