EaseUS Partition Master Portable is a standalone, "no-installation" version of the popular disk management software. It allows you to carry the utility on a USB flash drive, SSD, or SD card to manage partitions on any Windows PC without needing to download or install software on the host machine Key Features of the Portable Version
For a that is safe and free :
Q: Can I resize my system partition with EaseUS Partition Manager Portable? A: Yes, EaseUS Partition Manager Portable allows you to resize your system partition without losing data. easeus partition manager portable
Since there is no official portable release, any version you find online is a "cracked" or modified copy. Downloading these poses significant risks: How to Get and Use EaseUS Partition Master
A: Only if you have a multi-license or a technician license. A single personal license is usually for one user on one PC. Check EaseUS's EULA. A: Only if you have a multi-license or a technician license
If a computer won't boot due to partition errors, you can plug in your USB and fix the issue without needing to access the Windows desktop.