System Requirements

Windows

The software and hardware prerequisites for installing LibreOffice on a Windows system are as follows:

Microsoft Windows XP, Vista, Windows 7, or Windows 8;
Pentium-compatible PC (Pentium III, Athlon or more-recent system recommended);
256 Mb RAM (512 Mb RAM recommended);
Up to 1.5 Gb available hard disk space;
1024x768 resolution (higher resolution recommended), with at least 256 colors.

Administrator rights are needed for the installation process. It is a recommended best practice to back-up your system and data before you remove or install software.

For certain features of the software - but not most - Java is required. Java is notably required for Base.

Apple - Mac OS X

The software and hardware prerequisites for installing on a Apple Mac OS X computer are as follows:

Mac OS X 10.6 (Snow Leopard) or higher;
(since LibreOffice 4.1 - Mac OS X 10.4 Tiger for versions up to 4.0.x)
Intel processor;
(Note: as of LibreOffice v.4.1 support for PowerPC has been dropped);
512 Mb RAM;
Up to 800 Mb available hard disk space;
1024x768 graphic device with 256 colors (higher resolution recommended).

For certain features of the software - but not most - Java is required. Java is notably required for Base.

It is a recommended best practice to back-up your system and data before you remove or install software.

If you are running MacOS X 10.8 (Mountain Lion), you may run into a problem with Apple's new Gatekeeper. If so, you may find this article helpful. An easier solution to install the software and to run it the first time, right-click (control-click) the LibreOffice.app icon and choose Open from the context menu. You will be asked if you really want to start the program, confirm this to launch it.

GNU/Linux

As a general rule, you are recommended to install LibreOffice via the installation methods recommended by your particular Linux distribution (such as the Ubuntu Software Center, in the case of Ubuntu Linux).This is because it is usually the simplest way to obtain an installation that is optimally integrated into your system. Indeed, LibreOffice may well be already installed by default when you originally install your Linux operating system.

The community-supplied LibreOffice installers are provided for users having special needs, and for out-of-the-ordinary cases.

The software and hardware prerequisites for installing on Linux are as follows:

Linux kernel version 2.6.18 or higher;
glibc2 version 2.5 or higher;
gtk version 2.10.4 or higher;
Pentium-compatible PC (Pentium III, Athlon or more-recent system recommended);
256Mb RAM (512Mb RAM recommended);
Up to 1.55Gb available hard disk space;
X Server with 1024x768 resolution (higher resolution recommended), with at least 256 colors;
Gnome 2.16 or higher, with the gail 1.8.6 and at-spi 1.7 packages (required for support for assistive technology [AT] tools), or another compatible GUI (such as KDE, among others).

For certain features of the software - but not most - Java is required. Java is notably required for Base.

It is a recommended best practice to back-up your system and data before you remove or install software.