Is it possible to migrate from MBR to GPT? I'd prefer to not reinstall everything... I'vce searched a little but I cannot find an howto or tool to make it simple.
ive used Active@ boot disk then easeus partition manager to convert.. then make sure EFI folder is in root of drive (hidden or non hidden partition)
May i be the first to ask why you want to convert, because it's only needed when you want to use a system disk >2TB or when you want to use more then 4 primary partitions on one disk. Separate storage disks >2TB can be GPT initiated at diskmanagement.
And the guide I mentioned above exactly does so - it helps you to convert an MBR/legacy installation to GPT/UEFI installation on the fly.
Yes it is possible and no data loss guaranteed. I did it many times using "MiniTool Partition Wizard" v7.5. All you have to do is choosing the disk to be converted (even if it is your one and only HD that windows already running on). It will not take a minute, ask you to restart, restart and it will be done. First boot after asking for restart don't change boot from legacy to UEFI. Second boot you must change it from legacy to UEFI, otherwise windows may not boot (windows 7 may boot, but 8.1 & 10 may not).
That's only about basic converting any disk, for it to be able to boot uefi, there is more to do, as Tito's link will show you. If it is about a storage only disk, simple converting will work. Why would win 7 be able to boot uefi but the windows version 8.x and 10 not (they can boot uefi natively).