Safe way to convert mbr to gpt without formatting on windows 10?

You're thinking about converting your disk from MBR to GPT on your Windows machine, huh? First off, backup your stuff. Always, always back up important files before messing with disk partitioning. Things can go sideways if you accidentally delete the wrong partition or something weird happens during the conversion.

If you're doing it on a system drive (the one Windows is installed on), make sure you're clear on the process—using tools like Disk Management, DiskPart, or third-party apps. Sometimes, converting from MBR to GPT requires you to delete all partitions on that drive, which means you'd lose everything unless you back up. Also, if you’re planning to switch your boot drive to GPT, your BIOS needs to support UEFI mode. Otherwise, your PC might not boot after the conversion. Check your BIOS settings beforehand.

From experience, I’d say: do it when you're confident, and preferably on a non-system disk first, just to practice. If you’re unsure or nervous, there are plenty of guides online that walk you through it step-by-step.