The most reliable "portable" version is actually the web-based suite. Works on any browser (Chrome, Edge, Firefox). Full Compatibility: No formatting issues when moving files. Cost: Free for basic use with a Microsoft account.
For power users who need the full desktop features of Excel (like Macros or Power Pivot) on the move, you can install a full version of Windows and Office onto a high-speed USB 3.1 drive. No stripped-down menus. Privacy: All your temporary files stay on the USB stick. microsoft office portable best
If you find the official Microsoft web options too limiting and need a true .exe file that runs from a thumb drive, these alternatives provide the best compatibility: LibreOffice Portable The gold standard for open-source portability. Available via PortableApps.com. The most reliable "portable" version is actually the
Running software off a USB 2.0 drive will be painfully slow. Always use USB 3.0 or higher . Cost: Free for basic use with a Microsoft account
Interface feels slightly dated compared to modern Office. OnlyOffice Portable The best choice for visual fidelity.
Requires a high-performance flash drive (like a Samsung T7 or SanDisk Extreme). Top Alternatives to Microsoft Office Portable