GNU GRUB review
A broad, free boot manager for BIOS, UEFI, multiboot, and chain-loading setups.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
GNU GRUB is a free, open-source boot loader for managing startup across multiple operating systems. It is intended for users who need to load operating-system kernels, select boot entries, or chain-load another boot loader. GNU/Linux is a common use case, while chain-loading supports systems such as Windows. Its support for BIOS and EFI/UEFI environments makes it suitable for general-purpose boot management across different firmware configurations.
The standout strength is the range of boot controls in one tool. GRUB can load kernels and modules, present a configurable menu with timeout settings, edit boot entries from the menu, and provide an interactive command-line interface. It also includes a GRUB installation utility. Multiboot kernel loading and chain-loading extend its role beyond selecting a single operating system, making it useful where several kernels or boot loaders need to coexist.
GRUB is distributed under the GNU General Public License and does not require a paid tier. Its breadth makes it a strong choice for users seeking free, open-source control over BIOS or UEFI boot flows. It is less suitable for anyone expecting a conventional desktop application with a graphical setup experience, because it is a bootloader rather than a desktop application. Compatibility and behavior depend on firmware mode, architecture, and configuration, so users with a narrowly defined or highly managed boot environment may prefer a tool designed specifically for that setup.
GNU GRUB pros and cons
- Where it wins
- Supports both BIOS and EFI/UEFI boot environments
- Loads multiple kernels and chain-loads other boot loaders
- Offers configurable menus, entry editing, and a command line
- Where it doesn't
- Configuration depends on firmware mode, architecture, and setup
- It is a bootloader rather than a conventional desktop application
- Windows support is provided through chain-loading other boot loaders
GNU GRUB fact sheet, pricing and score →
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