A bootable partition tool is useful when Windows cannot start or the system partition cannot be changed while it is in use. The best choice is one that starts on your UEFI computer, detects its storage controller, and can see your backup. Do not assume that creating a USB or ISO proves it will work on the target PC.
Check UEFI and Secure Boot compatibility, support for the disk's file system and controller, whether the interface provides a clear disk map, and whether rescue media can access your backup drive. GParted Live can be a useful independent open-source option; Qiling Disk Master combines partition tools and backup access in one environment. Features and licensing vary, so check the version you will actually use.
Use a healthy Windows PC. Creating a bootable USB can erase that USB, so copy its files elsewhere first. The ISO route below creates a file; writing it to a USB or optical disc is a separate step.
Step 1. Open Tools and utilities and choose Create bootable media.

Step 2. Choose Export ISO file and a destination folder you can locate later. If your PC requires a special storage driver, locate the manufacturer-provided driver before building the media.

Step 3. Review the output path, click Proceed, and wait for completion. Confirm the ISO exists.

Step 4. Write the ISO to suitable boot media using a compatible tool, or use the Qiling USB option only after verifying and backing up the USB. Boot the target PC from the finished media through its UEFI boot menu.
Confirm the environment sees the intended disk by model and capacity and can open the backup destination. Exit without changing partitions. Only then plan a resize, conversion, or repair, with a verified image and BitLocker key available. See the wider bootable partition-manager comparison.