If you strictly need a version that runs from a USB drive with no installation, (available via PortableApps.com) is the gold standard. It is open-source, completely free, and compatible with .docx , .xlsx , and .pptx files. Conclusion
If you need the power of Office without the heavy footprint of a full local installation, there are several safe, official ways to achieve this: 1. Microsoft 365 Web Apps (The True Portable Office)
Requires an internet connection (though limited offline mode is available). 2. Microsoft Office Mobile Apps
In technical terms, a "portable" app is a program designed to run without being installed on a computer's operating system. It doesn't modify the Windows Registry or leave configuration files behind on the host machine.
Portable Microsoft Office 365 Highly Compressed Extra Quality ~repack~ May 2026
If you strictly need a version that runs from a USB drive with no installation, (available via PortableApps.com) is the gold standard. It is open-source, completely free, and compatible with .docx , .xlsx , and .pptx files. Conclusion
If you need the power of Office without the heavy footprint of a full local installation, there are several safe, official ways to achieve this: 1. Microsoft 365 Web Apps (The True Portable Office) If you strictly need a version that runs
Requires an internet connection (though limited offline mode is available). 2. Microsoft Office Mobile Apps Microsoft 365 Web Apps (The True Portable Office)
In technical terms, a "portable" app is a program designed to run without being installed on a computer's operating system. It doesn't modify the Windows Registry or leave configuration files behind on the host machine. It doesn't modify the Windows Registry or leave