GParted is an open-source, industry-standard partition editor. It is not a Windows application but a bootable ISO (live operating system).
To use the software safely and for free, you have two primary options: easeus partition master full portable free
Another heavy hitter in the industry with a robust free tier. GParted is an open-source
Many "repacked" portable versions contain keyloggers or ransomware. easeus partition master full portable free
The free edition covers the most common disk management needs for home users: