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

Noways, GPT is more recommended and this is why you should convert mbr to gpt for internal hard drive if you want to install Windows 11 or Windows 10. Below are the main practical reasons people change a Windows disk from the legacy MBR (Master Boot Record) layout to the modern GPT (GUID Partition Table).

1. Meet UEFI-and-Secure Boot requirements

Modern PCs ship with UEFI firmware and features like Secure Boot and Windows 11’s “modern standby.” Those require the system drive to be GPT so they can store their boot files in an EFI System Partition (ESP). If you plan to upgrade hardware—or install Windows 11—converting to GPT is often mandatory.

2. Faster boot & cleaner boot manager

With UEFI + GPT, hardware can jump straight to the EFI loader instead of parsing 16-bit BIOS code first. The gain is modest, but you also avoid legacy boot files like bootmgr and can manage multiple OS loaders from a graphical firmware menu.

3. Unlock the full capacity of large drives

MBR can only address 2 TB per physical disk. Anything beyond that space is invisible or must be carved into awkward “extra” volumes. GPT’s 64-bit addressing, by contrast, scales up to 9.4 zettabytes—effectively removing today’s size ceiling.

4. Create more than four primary partitions

An MBR disk is limited to four primary partitions (or three plus an extended partition). GPT supports up to 128 partitions in Windows, so dual-boot setups, recovery partitions, and vendor utilities no longer fight over a tiny quota.

Bottom line: If your motherboard supports UEFI and almost every system sold in the last decade doesswitching the system disk to GPT future-proofs your storage, removes size and partition limits, and opens the door to newer security features with virtually no downside once you have a verified backup.